55990044 has 72 divisors (see below), whose sum is σ = 163498608. Its totient is φ = 15966720.

The previous prime is 55990037. The next prime is 55990063. The reversal of 55990044 is 44009955.

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

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 55989990 and 55990008.

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, 2574 + ... + 10890.

It is an arithmetic number, because the mean of its divisors is an integer number (2270814).

Almost surely, 2^55990044 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 55990044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81749304).

55990044 is an abundant number, since it is smaller than the sum of its proper divisors (107508564).

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

55990044 is a wasteful number, since it uses less digits than its factorization.

55990044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8355 (or 8350 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 55990044 is about 7482.6495307478. The cubic root of 55990044 is about 382.5635624216.

Adding to 55990044 its reverse (44009955), we get a palindrome (99999999).

It can be divided in two parts, 55 and 990044, that added together give a palindrome (990099).

The spelling of 55990044 in words is "fifty-five million, nine hundred ninety thousand, forty-four".