718986618 has 80 divisors (see below), whose sum is σ = 1904791680. Its totient is φ = 198332064.

The previous prime is 718986599. The next prime is 718986623. The reversal of 718986618 is 816689817.

718986618 is a `hidden beast` number, since 7 + 18 + 9 + 8 + 6 + 618 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21955 + ... + 43817.

It is an arithmetic number, because the mean of its divisors is an integer number (23809896).

Almost surely, 2^718986618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 718986618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (952395840).

718986618 is an abundant number, since it is smaller than the sum of its proper divisors (1185805062).

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

718986618 is a wasteful number, since it uses less digits than its factorization.

718986618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21913 (or 21904 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 718986618 is about 26813.9258222290. The cubic root of 718986618 is about 895.8602542007.

The spelling of 718986618 in words is "seven hundred eighteen million, nine hundred eighty-six thousand, six hundred eighteen".