55616520 has 128 divisors (see below), whose sum is σ = 178848000. Its totient is φ = 13787136.

The previous prime is 55616479. The next prime is 55616549. The reversal of 55616520 is 2561655.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 279381 + ... + 279579.

It is an arithmetic number, because the mean of its divisors is an integer number (1397250).

Almost surely, 2^55616520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55616520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89424000).

55616520 is an abundant number, since it is smaller than the sum of its proper divisors (123231480).

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

55616520 is a wasteful number, since it uses less digits than its factorization.

55616520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 363 counting only the distinct ones).

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

The square root of 55616520 is about 7457.6484229280. The cubic root of 55616520 is about 381.7109368970.

The spelling of 55616520 in words is "fifty-five million, six hundred sixteen thousand, five hundred twenty".