55609776 has 60 divisors (see below), whose sum is σ = 159442920. Its totient is φ = 18082560.

The previous prime is 55609769. The next prime is 55609787. The reversal of 55609776 is 67790655.

It is a happy number.

55609776 is a `hidden beast` number, since 556 + 0 + 97 + 7 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1195 + ... + 10613.

It is an arithmetic number, because the mean of its divisors is an integer number (2657382).

Almost surely, 2^55609776 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 55609776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79721460).

55609776 is an abundant number, since it is smaller than the sum of its proper divisors (103833144).

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

55609776 is a wasteful number, since it uses less digits than its factorization.

55609776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9474 (or 9465 counting only the distinct ones).

The product of its (nonzero) digits is 396900, while the sum is 45.

The square root of 55609776 is about 7457.1962559664. The cubic root of 55609776 is about 381.6955076528.

The spelling of 55609776 in words is "fifty-five million, six hundred nine thousand, seven hundred seventy-six".