56172540 has 48 divisors (see below), whose sum is σ = 157635072. Its totient is φ = 14945856.

The previous prime is 56172533. The next prime is 56172593. The reversal of 56172540 is 4527165.

56172540 = T₄₉ + T₅₀ + ... + T₆₉₅.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 56172498 and 56172507.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38097 + ... + 39543.

It is an arithmetic number, because the mean of its divisors is an integer number (3284064).

Almost surely, 2^56172540 is an apocalyptic number.

It is an amenable number.

56172540 is an abundant number, since it is smaller than the sum of its proper divisors (101462532).

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

56172540 is a wasteful number, since it uses less digits than its factorization.

56172540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106 (or 2104 counting only the distinct ones).

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

The square root of 56172540 is about 7494.8342209818. The cubic root of 56172540 is about 382.9787588744.

The spelling of 56172540 in words is "fifty-six million, one hundred seventy-two thousand, five hundred forty".