55661028 has 12 divisors (see below), whose sum is σ = 129875760. Its totient is φ = 18553672.

The previous prime is 55661017. The next prime is 55661033. The reversal of 55661028 is 82016655.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 55661028.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2319198 + ... + 2319221.

It is an arithmetic number, because the mean of its divisors is an integer number (10822980).

Almost surely, 2^55661028 is an apocalyptic number.

It is an amenable number.

55661028 is an abundant number, since it is smaller than the sum of its proper divisors (74214732).

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

55661028 is a wasteful number, since it uses less digits than its factorization.

55661028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4638426 (or 4638424 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 55661028 is about 7460.6318767247. The cubic root of 55661028 is about 381.8127331525.

The spelling of 55661028 in words is "fifty-five million, six hundred sixty-one thousand, twenty-eight".