55305618 has 16 divisors (see below), whose sum is σ = 116433120. Its totient is φ = 17464896.

The previous prime is 55305587. The next prime is 55305647. The reversal of 55305618 is 81650355.

It is a super-2 number, since 2×55305618² = 6117422764723848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242455 + ... + 242682.

It is an arithmetic number, because the mean of its divisors is an integer number (7277070).

Almost surely, 2^55305618 is an apocalyptic number.

55305618 is an abundant number, since it is smaller than the sum of its proper divisors (61127502).

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

55305618 is a wasteful number, since it uses less digits than its factorization.

55305618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485161.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 55305618 is about 7436.7747041308. The cubic root of 55305618 is about 380.9983397672.

The spelling of 55305618 in words is "fifty-five million, three hundred five thousand, six hundred eighteen".