56621957 has 16 divisors (see below), whose sum is σ = 68396160. Its totient is φ = 45790272.

The previous prime is 56621953. The next prime is 56621987. The reversal of 56621957 is 75912665.

It is a cyclic number.

It is not a de Polignac number, because 56621957 - 2² = 56621953 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56621953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38243 + ... + 39695.

It is an arithmetic number, because the mean of its divisors is an integer number (4274760).

Almost surely, 2^56621957 is an apocalyptic number.

It is an amenable number.

56621957 is a deficient number, since it is larger than the sum of its proper divisors (11774203).

56621957 is a wasteful number, since it uses less digits than its factorization.

56621957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772.

The product of its digits is 113400, while the sum is 41.

The square root of 56621957 is about 7524.7562751228. The cubic root of 56621957 is about 383.9974071186.

The spelling of 56621957 in words is "fifty-six million, six hundred twenty-one thousand, nine hundred fifty-seven".