78668612 has 12 divisors (see below), whose sum is σ = 150185616. Its totient is φ = 35758440.

The previous prime is 78668609. The next prime is 78668621. The reversal of 78668612 is 21686687.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 1787923 = 78668612 / (7 + 8 + 6 + 6 + 8 + 6 + 1 + 2).

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, 893918 + ... + 894005.

It is an arithmetic number, because the mean of its divisors is an integer number (12515468).

Almost surely, 2^78668612 is an apocalyptic number.

It is an amenable number.

78668612 is a deficient number, since it is larger than the sum of its proper divisors (71517004).

78668612 is a wasteful number, since it uses less digits than its factorization.

78668612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787938 (or 1787936 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 78668612 is about 8869.5327949109. The cubic root of 78668612 is about 428.4832300831.

The spelling of 78668612 in words is "seventy-eight million, six hundred sixty-eight thousand, six hundred twelve".