55188440 has 32 divisors (see below), whose sum is σ = 124433280. Its totient is φ = 22029312.

The previous prime is 55188439. The next prime is 55188451. The reversal of 55188440 is 4488155.

55188440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 55188440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23144 + ... + 25416.

It is an arithmetic number, because the mean of its divisors is an integer number (3888540).

Almost surely, 2^55188440 is an apocalyptic number.

It is an amenable number.

55188440 is an abundant number, since it is smaller than the sum of its proper divisors (69244840).

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

55188440 is a wasteful number, since it uses less digits than its factorization.

55188440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891 (or 2887 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 55188440 is about 7428.8922458197. The cubic root of 55188440 is about 380.7290712173.

The spelling of 55188440 in words is "fifty-five million, one hundred eighty-eight thousand, four hundred forty".