55380388 has 36 divisors (see below), whose sum is σ = 115378032. Its totient is φ = 23178960.

The previous prime is 55380371. The next prime is 55380397. The reversal of 55380388 is 88308355.

It is a self number, because there is not a number n which added to its sum of digits gives 55380388.

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 11 ways as a sum of consecutive naturals, for example, 5143 + ... + 11713.

Almost surely, 2^55380388 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 55380388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57689016).

55380388 is an abundant number, since it is smaller than the sum of its proper divisors (59997644).

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

55380388 is a wasteful number, since it uses less digits than its factorization.

55380388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6632 (or 6623 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 55380388 is about 7441.8000510629. The cubic root of 55380388 is about 381.1699583648.

The spelling of 55380388 in words is "fifty-five million, three hundred eighty thousand, three hundred eighty-eight".