55163772 has 18 divisors (see below), whose sum is σ = 139441848. Its totient is φ = 18387912.

The previous prime is 55163753. The next prime is 55163807. The reversal of 55163772 is 27736155.

55163772 is a `hidden beast` number, since 551 + 6 + 37 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1532327 = 55163772 / (5 + 5 + 1 + 6 + 3 + 7 + 7 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 766128 + ... + 766199.

Almost surely, 2^55163772 is an apocalyptic number.

It is an amenable number.

55163772 is an abundant number, since it is smaller than the sum of its proper divisors (84278076).

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

55163772 is a wasteful number, since it uses less digits than its factorization.

55163772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532337 (or 1532332 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 55163772 is about 7427.2317858001. The cubic root of 55163772 is about 380.6723369665.

The spelling of 55163772 in words is "fifty-five million, one hundred sixty-three thousand, seven hundred seventy-two".