56661732 has 18 divisors (see below), whose sum is σ = 143228358. Its totient is φ = 18887232.

The previous prime is 56661727. The next prime is 56661749. The reversal of 56661732 is 23716665.

It can be written as a sum of positive squares in only one way, i.e., 55442916 + 1218816 = 7446^2 + 1104^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1573937 = 56661732 / (5 + 6 + 6 + 6 + 1 + 7 + 3 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 786933 + ... + 787004.

It is an arithmetic number, because the mean of its divisors is an integer number (7957131).

Almost surely, 2^56661732 is an apocalyptic number.

It is an amenable number.

56661732 is an abundant number, since it is smaller than the sum of its proper divisors (86566626).

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

56661732 is a wasteful number, since it uses less digits than its factorization.

56661732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573947 (or 1573942 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 56661732 is about 7527.3987538857. The cubic root of 56661732 is about 384.0873011144.

The spelling of 56661732 in words is "fifty-six million, six hundred sixty-one thousand, seven hundred thirty-two".