56139615844 has 45 divisors (see below), whose sum is σ = 106583112461. Its totient is φ = 25873629600.

The previous prime is 56139615821. The next prime is 56139615877. The reversal of 56139615844 is 44851693165.

It is a happy number.

The square root of 56139615844 is 236938.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 47235806244 + 8903809600 = 217338^2 + 94360^2 .

It is a super-2 number, since 2×56139615844² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56139615791 and 56139615800.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 80084694 + ... + 80085394.

Almost surely, 2^56139615844 is an apocalyptic number.

56139615844 is the 236938-th square number.

It is an amenable number.

56139615844 is a deficient number, since it is larger than the sum of its proper divisors (50443496617).

56139615844 is an frugal number, since it uses more digits than its factorization.

56139615844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458 (or 716 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 52.

The spelling of 56139615844 in words is "fifty-six billion, one hundred thirty-nine million, six hundred fifteen thousand, eight hundred forty-four".