55306660 has 12 divisors (see below), whose sum is σ = 116144028. Its totient is φ = 22122656.

The previous prime is 55306649. The next prime is 55306681. The reversal of 55306660 is 6660355.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 36505764 + 18800896 = 6042^2 + 4336^2 .

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, 1382647 + ... + 1382686.

It is an arithmetic number, because the mean of its divisors is an integer number (9678669).

Almost surely, 2^55306660 is an apocalyptic number.

It is an amenable number.

55306660 is an abundant number, since it is smaller than the sum of its proper divisors (60837368).

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

55306660 is a wasteful number, since it uses less digits than its factorization.

55306660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765342 (or 2765340 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 55306660 is about 7436.8447610529. The cubic root of 55306660 is about 381.0007325186. Note that the first 3 decimals are identical.

The spelling of 55306660 in words is "fifty-five million, three hundred six thousand, six hundred sixty".