55220688 has 60 divisors (see below), whose sum is σ = 162683040. Its totient is φ = 17437248.

The previous prime is 55220657. The next prime is 55220713. The reversal of 55220688 is 88602255.

55220688 is a `hidden beast` number, since 552 + 20 + 6 + 88 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7356 + ... + 12827.

It is an arithmetic number, because the mean of its divisors is an integer number (2711384).

Almost surely, 2^55220688 is an apocalyptic number.

It is an amenable number.

55220688 is an abundant number, since it is smaller than the sum of its proper divisors (107462352).

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

55220688 is a wasteful number, since it uses less digits than its factorization.

55220688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20216 (or 20207 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 55220688 is about 7431.0623735775. The cubic root of 55220688 is about 380.8032133170.

The spelling of 55220688 in words is "fifty-five million, two hundred twenty thousand, six hundred eighty-eight".