55021080 has 64 divisors (see below), whose sum is σ = 168917760. Its totient is φ = 14329728.

The previous prime is 55021073. The next prime is 55021097. The reversal of 55021080 is 8012055.

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, 172 + ... + 10491.

It is an arithmetic number, because the mean of its divisors is an integer number (2639340).

Almost surely, 2^55021080 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 55021080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84458880).

55021080 is an abundant number, since it is smaller than the sum of its proper divisors (113896680).

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

55021080 is a wasteful number, since it uses less digits than its factorization.

55021080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10720 (or 10716 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 55021080 is about 7417.6195642538. The cubic root of 55021080 is about 380.3438254690.

The spelling of 55021080 in words is "fifty-five million, twenty-one thousand, eighty".