55655388 has 18 divisors (see below), whose sum is σ = 140684544. Its totient is φ = 18551784.

The previous prime is 55655387. The next prime is 55655393. The reversal of 55655388 is 88355655.

55655388 is a `hidden beast` number, since 5 + 565 + 5 + 3 + 88 = 666.

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

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55655381) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 772956 + ... + 773027.

It is an arithmetic number, because the mean of its divisors is an integer number (7815808).

Almost surely, 2^55655388 is an apocalyptic number.

It is an amenable number.

55655388 is an abundant number, since it is smaller than the sum of its proper divisors (85029156).

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

55655388 is a wasteful number, since it uses less digits than its factorization.

55655388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545993 (or 1545988 counting only the distinct ones).

The product of its digits is 720000, while the sum is 45.

The square root of 55655388 is about 7460.2538830793. The cubic root of 55655388 is about 381.7998366572.

The spelling of 55655388 in words is "fifty-five million, six hundred fifty-five thousand, three hundred eighty-eight".