56781613320 has 64 divisors (see below), whose sum is σ = 173137400640. Its totient is φ = 14893536000.

The previous prime is 56781613313. The next prime is 56781613333. The reversal of 56781613320 is 2331618765.

It is a super-2 number, since 2×56781613320² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3871206 + ... + 3885845.

It is an arithmetic number, because the mean of its divisors is an integer number (2705271885).

Almost surely, 2^56781613320 is an apocalyptic number.

It is an amenable number.

56781613320 is an abundant number, since it is smaller than the sum of its proper divisors (116355787320).

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

56781613320 is a wasteful number, since it uses less digits than its factorization.

56781613320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7757126 (or 7757122 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 56781613320 in words is "fifty-six billion, seven hundred eighty-one million, six hundred thirteen thousand, three hundred twenty".