55615560 has 256 divisors, whose sum is σ = 224501760. Its totient is φ = 10644480.

The previous prime is 55615559. The next prime is 55615577. The reversal of 55615560 is 6551655.

It is a super-2 number, since 2×55615560² = 6186181028227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 119889 + ... + 120351.

It is an arithmetic number, because the mean of its divisors is an integer number (876960).

Almost surely, 2^55615560 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 55615560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112250880).

55615560 is an abundant number, since it is smaller than the sum of its proper divisors (168886200).

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

55615560 is a wasteful number, since it uses less digits than its factorization.

55615560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508 (or 504 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 55615560 is about 7457.5840591977. The cubic root of 55615560 is about 381.7087406395.

The spelling of 55615560 in words is "fifty-five million, six hundred fifteen thousand, five hundred sixty".