55388788 has 48 divisors (see below), whose sum is σ = 126330624. Its totient is φ = 20620800.

The previous prime is 55388783. The next prime is 55388791. The reversal of 55388788 is 88788355.

55388788 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55388788² = 6135835672217888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55388783) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1713 + ... + 10663.

It is an arithmetic number, because the mean of its divisors is an integer number (2631888).

Almost surely, 2^55388788 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 55388788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63165312).

55388788 is an abundant number, since it is smaller than the sum of its proper divisors (70941836).

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

55388788 is a wasteful number, since it uses less digits than its factorization.

55388788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8992 (or 8990 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 52.

The square root of 55388788 is about 7442.3644092452. The cubic root of 55388788 is about 381.1892291205.

The spelling of 55388788 in words is "fifty-five million, three hundred eighty-eight thousand, seven hundred eighty-eight".