55891044 has 72 divisors (see below), whose sum is σ = 157090752. Its totient is φ = 16610880.

The previous prime is 55891039. The next prime is 55891057. The reversal of 55891044 is 44019855.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19657 + ... + 22319.

It is an arithmetic number, because the mean of its divisors is an integer number (2181816).

Almost surely, 2^55891044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55891044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78545376).

55891044 is an abundant number, since it is smaller than the sum of its proper divisors (101199708).

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

55891044 is a wasteful number, since it uses less digits than its factorization.

55891044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737 (or 2732 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 55891044 is about 7476.0313000950. The cubic root of 55891044 is about 382.3379500664.

The spelling of 55891044 in words is "fifty-five million, eight hundred ninety-one thousand, forty-four".