56905557 has 8 divisors (see below), whose sum is σ = 76545984. Its totient is φ = 37601088.

The previous prime is 56905549. The next prime is 56905561. The reversal of 56905557 is 75550965.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56905557 - 2³ = 56905549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56905507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83593 + ... + 84270.

It is an arithmetic number, because the mean of its divisors is an integer number (9568248).

Almost surely, 2^56905557 is an apocalyptic number.

It is an amenable number.

56905557 is a deficient number, since it is larger than the sum of its proper divisors (19640427).

56905557 is a wasteful number, since it uses less digits than its factorization.

56905557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167979.

The product of its (nonzero) digits is 236250, while the sum is 42.

The square root of 56905557 is about 7543.5772018320. The cubic root of 56905557 is about 384.6374435851.

The spelling of 56905557 in words is "fifty-six million, nine hundred five thousand, five hundred fifty-seven".