55891788 has 24 divisors (see below), whose sum is σ = 131761392. Its totient is φ = 18438144.

The previous prime is 55891783. The next prime is 55891813. The reversal of 55891788 is 88719855.

It is a self number, because there is not a number n which added to its sum of digits gives 55891788.

It is not an unprimeable number, because it can be changed into a prime (55891783) 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, 22845 + ... + 25172.

It is an arithmetic number, because the mean of its divisors is an integer number (5490058).

Almost surely, 2^55891788 is an apocalyptic number.

It is an amenable number.

55891788 is an abundant number, since it is smaller than the sum of its proper divisors (75869604).

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

55891788 is a wasteful number, since it uses less digits than its factorization.

55891788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48121 (or 48119 counting only the distinct ones).

The product of its digits is 806400, while the sum is 51.

The square root of 55891788 is about 7476.0810589506. The cubic root of 55891788 is about 382.3396465706.

The spelling of 55891788 in words is "fifty-five million, eight hundred ninety-one thousand, seven hundred eighty-eight".