56891988858 has 16 divisors (see below), whose sum is σ = 114272323776. Its totient is φ = 18882605280.

The previous prime is 56891988847. The next prime is 56891988883. The reversal of 56891988858 is 85888919865.

It is a super-2 number, since 2×56891988858² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56891988858.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20346238 + ... + 20349033.

It is an arithmetic number, because the mean of its divisors is an integer number (7142020236).

Almost surely, 2^56891988858 is an apocalyptic number.

56891988858 is an abundant number, since it is smaller than the sum of its proper divisors (57380334918).

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

56891988858 is a wasteful number, since it uses less digits than its factorization.

56891988858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40695509.

The product of its digits is 398131200, while the sum is 75.

The spelling of 56891988858 in words is "fifty-six billion, eight hundred ninety-one million, nine hundred eighty-eight thousand, eight hundred fifty-eight".