55189988 has 24 divisors (see below), whose sum is σ = 110544000. Its totient is φ = 23617728.

The previous prime is 55189969. The next prime is 55189997. The reversal of 55189988 is 88998155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28433 + ... + 30311.

It is an arithmetic number, because the mean of its divisors is an integer number (4606000).

Almost surely, 2^55189988 is an apocalyptic number.

It is an amenable number.

55189988 is an abundant number, since it is smaller than the sum of its proper divisors (55354012).

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

55189988 is a wasteful number, since it uses less digits than its factorization.

55189988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2939 (or 2937 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 53.

The square root of 55189988 is about 7428.9964328972. The cubic root of 55189988 is about 380.7326309187.

Adding to 55189988 its sum of digits (53), we get a square (55190041 = 7429²).

The spelling of 55189988 in words is "fifty-five million, one hundred eighty-nine thousand, nine hundred eighty-eight".