56639958 has 16 divisors (see below), whose sum is σ = 117186480. Its totient is φ = 18228896.

The previous prime is 56639951. The next prime is 56639959. The reversal of 56639958 is 85993665.

It is a self number, because there is not a number n which added to its sum of digits gives 56639958.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 162585 + ... + 162932.

It is an arithmetic number, because the mean of its divisors is an integer number (7324155).

Almost surely, 2^56639958 is an apocalyptic number.

56639958 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

56639958 is an abundant number, since it is smaller than the sum of its proper divisors (60546522).

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

56639958 is a wasteful number, since it uses less digits than its factorization.

56639958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325551.

The product of its digits is 1749600, while the sum is 51.

The square root of 56639958 is about 7525.9522985467. The cubic root of 56639958 is about 384.0380957214.

The spelling of 56639958 in words is "fifty-six million, six hundred thirty-nine thousand, nine hundred fifty-eight".