55565638 has 16 divisors (see below), whose sum is σ = 85910400. Its totient is φ = 26934336.

The previous prime is 55565621. The next prime is 55565641. The reversal of 55565638 is 83656555.

It is a junction number, because it is equal to n+sod(n) for n = 55565594 and 55565603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21963 + ... + 24361.

It is an arithmetic number, because the mean of its divisors is an integer number (5369400).

Almost surely, 2^55565638 is an apocalyptic number.

55565638 is a deficient number, since it is larger than the sum of its proper divisors (30344762).

55565638 is a wasteful number, since it uses less digits than its factorization.

55565638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751.

The product of its digits is 540000, while the sum is 43.

The square root of 55565638 is about 7454.2362452501. The cubic root of 55565638 is about 381.5944958237.

The spelling of 55565638 in words is "fifty-five million, five hundred sixty-five thousand, six hundred thirty-eight".