78613684 has 12 divisors (see below), whose sum is σ = 138065508. Its totient is φ = 39166400.

The previous prime is 78613679. The next prime is 78613723. The reversal of 78613684 is 48631687.

It can be written as a sum of positive squares in 2 ways, for example, as 28515600 + 50098084 = 5340^2 + 7078^2 .

It is a super-2 number, since 2×78613684² = 12360222624103712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78613684.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33847 + ... + 36094.

It is an arithmetic number, because the mean of its divisors is an integer number (11505459).

Almost surely, 2^78613684 is an apocalyptic number.

It is an amenable number.

78613684 is a deficient number, since it is larger than the sum of its proper divisors (59451824).

78613684 is a wasteful number, since it uses less digits than its factorization.

78613684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70226 (or 70224 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 78613684 is about 8866.4358115310. The cubic root of 78613684 is about 428.3834816740.

It can be divided in two parts, 78613 and 684, that added together give a palindrome (79297).

The spelling of 78613684 in words is "seventy-eight million, six hundred thirteen thousand, six hundred eighty-four".