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16000000 = 21056
BaseRepresentation
bin111101000010…
…010000000000
31010002212212121
4331002100000
513044000000
61330534024
7252666142
oct75022000
933085777
1016000000
119039045
125437314
133412873
1421a6c92
151610b1a
hexf42400

16000000 has 77 divisors (see below), whose sum is σ = 39979957. Its totient is φ = 6400000.

The previous prime is 15999989. The next prime is 16000057. The reversal of 16000000 is 61.

Adding to 16000000 its reverse (61), we get a palindrome (16000061).

The square root of 16000000 is 4000.

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

It can be written as a sum of positive squares in 3 ways, for example, as 14017536 + 1982464 = 3744^2 + 1408^2 .

It is an ABA number since it can be written as A⋅BA, here for A=5, B=20.

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 unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 6 ways as a sum of consecutive naturals, for example, 3199998 + ... + 3200002.

Almost surely, 216000000 is an apocalyptic number.

16000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16000000 is the 4000-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16000000

16000000 is an abundant number, since it is smaller than the sum of its proper divisors (23979957).

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

16000000 is an frugal number, since it uses more digits than its factorization.

16000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 7.

The cubic root of 16000000 is about 251.9842099790.

The spelling of 16000000 in words is "sixteen 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 80 100 125 128 160 200 250 256 320 400 500 512 625 640 800 1000 1024 1250 1280 1600 2000 2500 2560 3125 3200 4000 5000 5120 6250 6400 8000 10000 12500 12800 15625 16000 20000 25000 25600 31250 32000 40000 50000 62500 64000 80000 100000 125000 128000 160000 200000 250000 320000 400000 500000 640000 800000 1000000 1600000 2000000 3200000 4000000 8000000 16000000