55621944 has 64 divisors (see below), whose sum is σ = 176582400. Its totient is φ = 15891552.

The previous prime is 55621939. The next prime is 55621991. The reversal of 55621944 is 44912655.

55621944 is a `hidden beast` number, since 5 + 562 + 1 + 94 + 4 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 55621899 and 55621908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16882 + ... + 19905.

It is an arithmetic number, because the mean of its divisors is an integer number (2759100).

Almost surely, 2^55621944 is an apocalyptic number.

55621944 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

55621944 is an abundant number, since it is smaller than the sum of its proper divisors (120960456).

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

55621944 is a wasteful number, since it uses less digits than its factorization.

55621944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36809 (or 36799 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 55621944 is about 7458.0120675687. The cubic root of 55621944 is about 381.7233452775.

It can be divided in two parts, 55621 and 944, that added together give a palindrome (56565).

The spelling of 55621944 in words is "fifty-five million, six hundred twenty-one thousand, nine hundred forty-four".