78686608 has 160 divisors (see below), whose sum is σ = 217486080. Its totient is φ = 26634240.

The previous prime is 78686593. The next prime is 78686633. The reversal of 78686608 is 80668687.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4628616 + ... + 4628632.

It is an arithmetic number, because the mean of its divisors is an integer number (1359288).

Almost surely, 2^78686608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78686608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108743040).

78686608 is an abundant number, since it is smaller than the sum of its proper divisors (138799472).

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

78686608 is a wasteful number, since it uses less digits than its factorization.

78686608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 78686608 is about 8870.5472210005. The cubic root of 78686608 is about 428.5159004460.

It can be divided in two parts, 78 and 686608, that added together give a palindrome (686686).

The spelling of 78686608 in words is "seventy-eight million, six hundred eighty-six thousand, six hundred eight".