55188120 has 128 divisors (see below), whose sum is σ = 188879040. Its totient is φ = 12779520.

The previous prime is 55188083. The next prime is 55188149. The reversal of 55188120 is 2188155.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 25480 + ... + 27560.

Almost surely, 2^55188120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55188120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94439520).

55188120 is an abundant number, since it is smaller than the sum of its proper divisors (133690920).

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

55188120 is a wasteful number, since it uses less digits than its factorization.

55188120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125 (or 2121 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 55188120 is about 7428.8707082571. The cubic root of 55188120 is about 380.7283353535.

The spelling of 55188120 in words is "fifty-five million, one hundred eighty-eight thousand, one hundred twenty".