55109388 has 18 divisors (see below), whose sum is σ = 128648604. Its totient is φ = 18361224.

The previous prime is 55109381. The next prime is 55109389. The reversal of 55109388 is 88390155.

It is not an unprimeable number, because it can be changed into a prime (55109381) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24645 + ... + 26787.

Almost surely, 2^55109388 is an apocalyptic number.

It is an amenable number.

55109388 is an abundant number, since it is smaller than the sum of its proper divisors (73539216).

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

55109388 is an equidigital number, since it uses as much as digits as its factorization.

55109388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4293 (or 2148 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 55109388 is about 7423.5697612402. The cubic root of 55109388 is about 380.5471987304.

Multiplying 55109388 by its product of nonzero digits (43200), we get a square (2380725561600 = 1542960²).

The spelling of 55109388 in words is "fifty-five million, one hundred nine thousand, three hundred eighty-eight".