55218680 has 32 divisors (see below), whose sum is σ = 135537840. Its totient is φ = 20079360.

The previous prime is 55218679. The next prime is 55218701. The reversal of 55218680 is 8681255.

It is a happy number.

55218680 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 55218680.

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, 62309 + ... + 63188.

Almost surely, 2^55218680 is an apocalyptic number.

It is an amenable number.

55218680 is an abundant number, since it is smaller than the sum of its proper divisors (80319160).

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

55218680 is a wasteful number, since it uses less digits than its factorization.

55218680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125519 (or 125515 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 55218680 is about 7430.9272638077. The cubic root of 55218680 is about 380.7985975221.

The spelling of 55218680 in words is "fifty-five million, two hundred eighteen thousand, six hundred eighty".