85638618 has 48 divisors (see below), whose sum is σ = 203243040. Its totient is φ = 25899552.

The previous prime is 85638613. The next prime is 85638649. The reversal of 85638618 is 81683658.

85638618 is a `hidden beast` number, since 8 + 5 + 638 + 6 + 1 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85638613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10705 + ... + 16907.

It is an arithmetic number, because the mean of its divisors is an integer number (4234230).

Almost surely, 2^85638618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85638618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101621520).

85638618 is an abundant number, since it is smaller than the sum of its proper divisors (117604422).

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

85638618 is a wasteful number, since it uses less digits than its factorization.

85638618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6283 (or 6280 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 85638618 is about 9254.1135718123. The cubic root of 85638618 is about 440.7813561295.

The spelling of 85638618 in words is "eighty-five million, six hundred thirty-eight thousand, six hundred eighteen".