55618520 has 32 divisors (see below), whose sum is σ = 129459600. Its totient is φ = 21479808.

The previous prime is 55618513. The next prime is 55618561. The reversal of 55618520 is 2581655.

55618520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 22814 + ... + 25133.

Almost surely, 2^55618520 is an apocalyptic number.

It is an amenable number.

55618520 is an abundant number, since it is smaller than the sum of its proper divisors (73841080).

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

55618520 is a wasteful number, since it uses less digits than its factorization.

55618520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47987 (or 47983 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 55618520 is about 7457.7825122485. The cubic root of 55618520 is about 381.7155123524.

The spelling of 55618520 in words is "fifty-five million, six hundred eighteen thousand, five hundred twenty".