55642188 has 24 divisors (see below), whose sum is σ = 148379392. Its totient is φ = 15897744.

The previous prime is 55642183. The next prime is 55642189. The reversal of 55642188 is 88124655.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (55642183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331120 + ... + 331287.

Almost surely, 2^55642188 is an apocalyptic number.

It is an amenable number.

55642188 is an abundant number, since it is smaller than the sum of its proper divisors (92737204).

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

55642188 is a wasteful number, since it uses less digits than its factorization.

55642188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662421 (or 662419 counting only the distinct ones).

The product of its digits is 76800, while the sum is 39.

The square root of 55642188 is about 7459.3691422264. The cubic root of 55642188 is about 381.7696499643.

The spelling of 55642188 in words is "fifty-five million, six hundred forty-two thousand, one hundred eighty-eight".