56618988 has 12 divisors (see below), whose sum is σ = 132111000. Its totient is φ = 18872992.

The previous prime is 56618987. The next prime is 56619007. The reversal of 56618988 is 88981665.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 56618988.

It is not an unprimeable number, because it can be changed into a prime (56618981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2359113 + ... + 2359136.

It is an arithmetic number, because the mean of its divisors is an integer number (11009250).

Almost surely, 2^56618988 is an apocalyptic number.

It is an amenable number.

56618988 is an abundant number, since it is smaller than the sum of its proper divisors (75492012).

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

56618988 is a wasteful number, since it uses less digits than its factorization.

56618988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4718256 (or 4718254 counting only the distinct ones).

The product of its digits is 829440, while the sum is 51.

The square root of 56618988 is about 7524.5589903994. The cubic root of 56618988 is about 383.9906953041.

The spelling of 56618988 in words is "fifty-six million, six hundred eighteen thousand, nine hundred eighty-eight".