172520256 has 28 divisors (see below), whose sum is σ = 456460352. Its totient is φ = 57506688.

The previous prime is 172520219. The next prime is 172520281. The reversal of 172520256 is 652025271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449080 + ... + 449463.

Almost surely, 2^172520256 is an apocalyptic number.

172520256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

172520256 is an abundant number, since it is smaller than the sum of its proper divisors (283940096).

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

172520256 is an equidigital number, since it uses as much as digits as its factorization.

172520256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898558 (or 898548 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 172520256 is about 13134.6966466683. The cubic root of 172520256 is about 556.6899290282.

The spelling of 172520256 in words is "one hundred seventy-two million, five hundred twenty thousand, two hundred fifty-six".