56172520 has 32 divisors (see below), whose sum is σ = 129081600. Its totient is φ = 21990208.

The previous prime is 56172517. The next prime is 56172533. The reversal of 56172520 is 2527165.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13060 + ... + 16819.

It is an arithmetic number, because the mean of its divisors is an integer number (4033800).

Almost surely, 2^56172520 is an apocalyptic number.

It is an amenable number.

56172520 is an abundant number, since it is smaller than the sum of its proper divisors (72909080).

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

56172520 is a wasteful number, since it uses less digits than its factorization.

56172520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29937 (or 29933 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 56172520 is about 7494.8328867294. The cubic root of 56172520 is about 382.9787134218.

Adding to 56172520 its reverse (2527165), we get a palindrome (58699685).

The spelling of 56172520 in words is "fifty-six million, one hundred seventy-two thousand, five hundred twenty".