55518630 has 32 divisors (see below), whose sum is σ = 133671168. Its totient is φ = 14757600.

The previous prime is 55518607. The next prime is 55518643. The reversal of 55518630 is 3681555.

It is a junction number, because it is equal to n+sod(n) for n = 55518591 and 55518600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7135 + ... + 12725.

It is an arithmetic number, because the mean of its divisors is an integer number (4177224).

Almost surely, 2^55518630 is an apocalyptic number.

55518630 is an abundant number, since it is smaller than the sum of its proper divisors (78152538).

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

55518630 is a wasteful number, since it uses less digits than its factorization.

55518630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5932.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 55518630 is about 7451.0824716950. The cubic root of 55518630 is about 381.4868570290.

The spelling of 55518630 in words is "fifty-five million, five hundred eighteen thousand, six hundred thirty".