56615643 has 12 divisors (see below), whose sum is σ = 93460848. Its totient is φ = 32351760.

The previous prime is 56615639. The next prime is 56615677. The reversal of 56615643 is 34651665.

56615643 is a `hidden beast` number, since 5 + 6 + 6 + 1 + 5 + 643 = 666.

It is not a de Polignac number, because 56615643 - 2² = 56615639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56615598 and 56615607.

It is not an unprimeable number, because it can be changed into a prime (56615243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 449268 + ... + 449393.

It is an arithmetic number, because the mean of its divisors is an integer number (7788404).

Almost surely, 2^56615643 is an apocalyptic number.

56615643 is a deficient number, since it is larger than the sum of its proper divisors (36845205).

56615643 is a wasteful number, since it uses less digits than its factorization.

56615643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898674 (or 898671 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 56615643 is about 7524.3367149537. The cubic root of 56615643 is about 383.9831332110.

The spelling of 56615643 in words is "fifty-six million, six hundred fifteen thousand, six hundred forty-three".