55700820 has 72 divisors (see below), whose sum is σ = 193100544. Its totient is φ = 12731328.

The previous prime is 55700797. The next prime is 55700833. The reversal of 55700820 is 2800755.

It is a happy number.

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, 20844 + ... + 23363.

It is an arithmetic number, because the mean of its divisors is an integer number (2681952).

Almost surely, 2^55700820 is an apocalyptic number.

It is an amenable number.

55700820 is an abundant number, since it is smaller than the sum of its proper divisors (137399724).

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

55700820 is a wasteful number, since it uses less digits than its factorization.

55700820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44229 (or 44224 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 55700820 is about 7463.2981985179. The cubic root of 55700820 is about 381.9036972960.

The spelling of 55700820 in words is "fifty-five million, seven hundred thousand, eight hundred twenty".