55613812 has 18 divisors (see below), whose sum is σ = 100117878. Its totient is φ = 27011232.

The previous prime is 55613797. The next prime is 55613821. The reversal of 55613812 is 21831655.

It can be written as a sum of positive squares in 3 ways, for example, as 646416 + 54967396 = 804^2 + 7414^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90418 + ... + 91030.

Almost surely, 2^55613812 is an apocalyptic number.

It is an amenable number.

55613812 is a deficient number, since it is larger than the sum of its proper divisors (44504066).

55613812 is an equidigital number, since it uses as much as digits as its factorization.

55613812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267 (or 652 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 55613812 is about 7457.4668621456. The cubic root of 55613812 is about 381.7047415556.

The spelling of 55613812 in words is "fifty-five million, six hundred thirteen thousand, eight hundred twelve".