78897079986 has 32 divisors (see below), whose sum is σ = 168578223360. Its totient is φ = 24543001296.

The previous prime is 78897079979. The next prime is 78897079991. The reversal of 78897079986 is 68997079887.

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 15 ways as a sum of consecutive naturals, for example, 5157136 + ... + 5172411.

It is an arithmetic number, because the mean of its divisors is an integer number (5268069480).

Almost surely, 2^78897079986 is an apocalyptic number.

78897079986 is an abundant number, since it is smaller than the sum of its proper divisors (89681143374).

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

78897079986 is a wasteful number, since it uses less digits than its factorization.

78897079986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10329638.

The product of its (nonzero) digits is 768144384, while the sum is 78.

Subtracting from 78897079986 its reverse (68997079887), we obtain a palindrome (9900000099).

The spelling of 78897079986 in words is "seventy-eight billion, eight hundred ninety-seven million, seventy-nine thousand, nine hundred eighty-six".