55163388 has 24 divisors (see below), whose sum is σ = 147102592. Its totient is φ = 15760944.

The previous prime is 55163371. The next prime is 55163393. The reversal of 55163388 is 88336155.

It is a super-4 number, since 4×55163388⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328270 + ... + 328437.

Almost surely, 2^55163388 is an apocalyptic number.

It is an amenable number.

55163388 is an abundant number, since it is smaller than the sum of its proper divisors (91939204).

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

55163388 is a wasteful number, since it uses less digits than its factorization.

55163388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656721 (or 656719 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 55163388 is about 7427.2059349395. The cubic root of 55163388 is about 380.6714536663.

The spelling of 55163388 in words is "fifty-five million, one hundred sixty-three thousand, three hundred eighty-eight".