Search a number
-
+
28080225 = 3252373373
BaseRepresentation
bin110101100011…
…1100001100001
31221211121211100
41223013201201
524142031400
62441505013
7460451355
oct153074141
957747740
1028080225
111493a0a8
1294a2169
135a82224
143a2d465
1526ea100
hex1ac7861

28080225 has 36 divisors (see below), whose sum is σ = 51669436. Its totient is φ = 14567040.

The previous prime is 28080211. The next prime is 28080229. The reversal of 28080225 is 52208082.

It can be written as a sum of positive squares in 6 ways, for example, as 4809249 + 23270976 = 2193^2 + 4824^2 .

It is not a de Polignac number, because 28080225 - 27 = 28080097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28080229) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6639 + ... + 10011.

Almost surely, 228080225 is an apocalyptic number.

28080225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28080225 is a deficient number, since it is larger than the sum of its proper divisors (23589211).

28080225 is a wasteful number, since it uses less digits than its factorization.

28080225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426 (or 3418 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 28080225 is about 5299.0777499486. The cubic root of 28080225 is about 303.9486329703.

The spelling of 28080225 in words is "twenty-eight million, eighty thousand, two hundred twenty-five".

Divisors: 1 3 5 9 15 25 37 45 75 111 185 225 333 555 925 1665 2775 3373 8325 10119 16865 30357 50595 84325 124801 151785 252975 374403 624005 758925 1123209 1872015 3120025 5616045 9360075 28080225