55521872 has 80 divisors (see below), whose sum is σ = 128241792. Its totient is φ = 22794240.

The previous prime is 55521859. The next prime is 55521883. The reversal of 55521872 is 27812555.

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, 491288 + ... + 491400.

Almost surely, 2^55521872 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 55521872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64120896).

55521872 is an abundant number, since it is smaller than the sum of its proper divisors (72719920).

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

55521872 is a wasteful number, since it uses less digits than its factorization.

55521872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 270 counting only the distinct ones).

The product of its digits is 28000, while the sum is 35.

The square root of 55521872 is about 7451.3000208017. The cubic root of 55521872 is about 381.4942825024.

The spelling of 55521872 in words is "fifty-five million, five hundred twenty-one thousand, eight hundred seventy-two".