56511728280 has 96 divisors (see below), whose sum is σ = 209900714400. Its totient is φ = 12916965888.

The previous prime is 56511728263. The next prime is 56511728311. The reversal of 56511728280 is 8282711565.

56511728280 is a `hidden beast` number, since 56 + 511 + 7 + 2 + 8 + 2 + 80 = 666.

It is a super-3 number, since 3×56511728280³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11210125 + ... + 11215164.

It is an arithmetic number, because the mean of its divisors is an integer number (2186465775).

Almost surely, 2^56511728280 is an apocalyptic number.

It is an amenable number.

56511728280 is an abundant number, since it is smaller than the sum of its proper divisors (153388986120).

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

56511728280 is a wasteful number, since it uses less digits than its factorization.

56511728280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22425313 (or 22425306 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The spelling of 56511728280 in words is "fifty-six billion, five hundred eleven million, seven hundred twenty-eight thousand, two hundred eighty".