55621560 has 32 divisors (see below), whose sum is σ = 166865040. Its totient is φ = 14832384.

The previous prime is 55621549. The next prime is 55621561. The reversal of 55621560 is 6512655.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55621561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231637 + ... + 231876.

Almost surely, 2^55621560 is an apocalyptic number.

It is an amenable number.

55621560 is an abundant number, since it is smaller than the sum of its proper divisors (111243480).

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

55621560 is a wasteful number, since it uses less digits than its factorization.

55621560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463527 (or 463523 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 55621560 is about 7457.9863233986. The cubic root of 55621560 is about 381.7224668346.

The spelling of 55621560 in words is "fifty-five million, six hundred twenty-one thousand, five hundred sixty".