55987790 has 16 divisors (see below), whose sum is σ = 101516112. Its totient is φ = 22231104.

The previous prime is 55987781. The next prime is 55987807. The reversal of 55987790 is 9778955.

It is a congruent number.

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, 19064 + ... + 21803.

It is an arithmetic number, because the mean of its divisors is an integer number (6344757).

Almost surely, 2^55987790 is an apocalyptic number.

55987790 is a deficient number, since it is larger than the sum of its proper divisors (45528322).

55987790 is a wasteful number, since it uses less digits than its factorization.

55987790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41011.

The product of its (nonzero) digits is 793800, while the sum is 50.

The square root of 55987790 is about 7482.4989141329. The cubic root of 55987790 is about 382.5584287122.

The spelling of 55987790 in words is "fifty-five million, nine hundred eighty-seven thousand, seven hundred ninety".