55086660 has 144 divisors (see below), whose sum is σ = 176707440. Its totient is φ = 13870080.

The previous prime is 55086653. The next prime is 55086697. The reversal of 55086660 is 6668055.

It can be written as a sum of positive squares in 8 ways, for example, as 799236 + 54287424 = 894^2 + 7368^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 318334 + ... + 318506.

It is an arithmetic number, because the mean of its divisors is an integer number (1227135).

Almost surely, 2^55086660 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 55086660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88353720).

55086660 is an abundant number, since it is smaller than the sum of its proper divisors (121620780).

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

55086660 is a wasteful number, since it uses less digits than its factorization.

55086660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 55086660 is about 7422.0388034556. The cubic root of 55086660 is about 380.4948769372.

The spelling of 55086660 in words is "fifty-five million, eighty-six thousand, six hundred sixty".