56639955 has 16 divisors (see below), whose sum is σ = 90869760. Its totient is φ = 30126048.

The previous prime is 56639951. The next prime is 56639959. The reversal of 56639955 is 55993665.

It is an interprime number because it is at equal distance from previous prime (56639951) and next prime (56639959).

It is not a de Polignac number, because 56639955 - 2² = 56639951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56639951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 816 + ... + 10674.

It is an arithmetic number, because the mean of its divisors is an integer number (5679360).

Almost surely, 2^56639955 is an apocalyptic number.

56639955 is a deficient number, since it is larger than the sum of its proper divisors (34229805).

56639955 is a wasteful number, since it uses less digits than its factorization.

56639955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10250.

The product of its digits is 1093500, while the sum is 48.

The square root of 56639955 is about 7525.9520992363. The cubic root of 56639955 is about 384.0380889410.

The spelling of 56639955 in words is "fifty-six million, six hundred thirty-nine thousand, nine hundred fifty-five".