78678686 has 8 divisors (see below), whose sum is σ = 124960320. Its totient is φ = 37025248.

The previous prime is 78678679. The next prime is 78678763. The reversal of 78678686 is 68687687.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1157006 + ... + 1157073.

It is an arithmetic number, because the mean of its divisors is an integer number (15620040).

Almost surely, 2^78678686 is an apocalyptic number.

78678686 is a deficient number, since it is larger than the sum of its proper divisors (46281634).

78678686 is a wasteful number, since it uses less digits than its factorization.

78678686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314098.

The product of its digits is 5419008, while the sum is 56.

The square root of 78678686 is about 8870.1006758661. The cubic root of 78678686 is about 428.5015192741.

Subtracting from 78678686 its reverse (68687687), we obtain a palindrome (9990999).

The spelling of 78678686 in words is "seventy-eight million, six hundred seventy-eight thousand, six hundred eighty-six".