78631888618 has 32 divisors (see below), whose sum is σ = 124078703616. Its totient is φ = 37301413248.

The previous prime is 78631888613. The next prime is 78631888627. The reversal of 78631888618 is 81688813687.

It is a self number, because there is not a number n which added to its sum of digits gives 78631888618.

It is not an unprimeable number, because it can be changed into a prime (78631888613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2827630 + ... + 2855302.

It is an arithmetic number, because the mean of its divisors is an integer number (3877459488).

Almost surely, 2^78631888618 is an apocalyptic number.

78631888618 is a deficient number, since it is larger than the sum of its proper divisors (45446814998).

78631888618 is a wasteful number, since it uses less digits than its factorization.

78631888618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28198.

The product of its digits is 24772608, while the sum is 64.

The spelling of 78631888618 in words is "seventy-eight billion, six hundred thirty-one million, eight hundred eighty-eight thousand, six hundred eighteen".