78988986 has 16 divisors (see below), whose sum is σ = 175531200. Its totient is φ = 26329644.

The previous prime is 78988937. The next prime is 78988997. The reversal of 78988986 is 68988987.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 731326 + ... + 731433.

It is an arithmetic number, because the mean of its divisors is an integer number (10970700).

Almost surely, 2^78988986 is an apocalyptic number.

78988986 is an abundant number, since it is smaller than the sum of its proper divisors (96542214).

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

78988986 is a wasteful number, since it uses less digits than its factorization.

78988986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462770 (or 1462764 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 63.

The square root of 78988986 is about 8887.5748098117. The cubic root of 78988986 is about 429.0641011360.

Subtracting from 78988986 its reverse (68988987), we obtain a palindrome (9999999).

The spelling of 78988986 in words is "seventy-eight million, nine hundred eighty-eight thousand, nine hundred eighty-six".