55857618 has 24 divisors (see below), whose sum is σ = 121832256. Its totient is φ = 18495000.

The previous prime is 55857611. The next prime is 55857649. The reversal of 55857618 is 81675855.

55857618 is a `hidden beast` number, since 5 + 585 + 7 + 61 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55857611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7558 + ... + 12993.

It is an arithmetic number, because the mean of its divisors is an integer number (5076344).

Almost surely, 2^55857618 is an apocalyptic number.

55857618 is an abundant number, since it is smaller than the sum of its proper divisors (65974638).

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

55857618 is a wasteful number, since it uses less digits than its factorization.

55857618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20710 (or 20707 counting only the distinct ones).

The product of its digits is 336000, while the sum is 45.

The square root of 55857618 is about 7473.7954213371. The cubic root of 55857618 is about 382.2617149729.

It can be divided in two parts, 5585 and 7618, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 55857618 in words is "fifty-five million, eight hundred fifty-seven thousand, six hundred eighteen".