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25000000 = 2658
BaseRepresentation
bin101111101011…
…1100001000000
31202001010112221
41133113201000
522400000000
62251500424
7422332204
oct137274100
952033487
1025000000
1113125963
128457714
1352441cc
14346ab04
1522dc61a
hex17d7840

25000000 has 63 divisors (see below), whose sum is σ = 62011687. Its totient is φ = 10000000.

The previous prime is 24999983. The next prime is 25000009. The reversal of 25000000 is 52.

Adding to 25000000 its reverse (52), we get a palindrome (25000052).

It can be divided in two parts, 2 and 5000000, that multiplied together give a 7-th power (10000000 = 107).

The square root of 25000000 is 5000.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 17774656 + 7225344 = 4216^2 + 2688^2 .

It is a sliding number, since 25000000 = 5000000 + 20000000 and 1/5000000 + 1/20000000 = 0.00000025000000.

It is an ABA number since it can be written as A⋅BA, here for A=4, B=50.

It is a hoax number, since the sum of its digits (7) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an enlightened number because it begins with the concatenation of its prime factors (25).

It is not an unprimeable number, because it can be changed into a prime (25000009) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4999998 + ... + 5000002.

Almost surely, 225000000 is an apocalyptic number.

25000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

25000000 is the 5000-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25000000

25000000 is an abundant number, since it is smaller than the sum of its proper divisors (37011687).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25000000 is an frugal number, since it uses more digits than its factorization.

25000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 7.

The cubic root of 25000000 is about 292.4017738213.

The spelling of 25000000 in words is "twenty-five million", and thus it is an aban number and an uban number.

Divisors: 1 2 4 5 8 10 16 20 25 32 40 50 64 80 100 125 160 200 250 320 400 500 625 800 1000 1250 1600 2000 2500 3125 4000 5000 6250 8000 10000 12500 15625 20000 25000 31250 40000 50000 62500 78125 100000 125000 156250 200000 250000 312500 390625 500000 625000 781250 1000000 1250000 1562500 2500000 3125000 5000000 6250000 12500000 25000000