56661636 has 24 divisors (see below), whose sum is σ = 133449120. Its totient is φ = 18710272.

The previous prime is 56661617. The next prime is 56661641. The reversal of 56661636 is 63616665.

It is a junction number, because it is equal to n+sod(n) for n = 56661594 and 56661603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20781 + ... + 23348.

It is an arithmetic number, because the mean of its divisors is an integer number (5560380).

Almost surely, 2^56661636 is an apocalyptic number.

It is an amenable number.

56661636 is an abundant number, since it is smaller than the sum of its proper divisors (76787484).

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

56661636 is a wasteful number, since it uses less digits than its factorization.

56661636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44243 (or 44241 counting only the distinct ones).

The product of its digits is 116640, while the sum is 39.

The square root of 56661636 is about 7527.3923771782. The cubic root of 56661636 is about 384.0870841991.

The spelling of 56661636 in words is "fifty-six million, six hundred sixty-one thousand, six hundred thirty-six".