78115612 has 48 divisors (see below), whose sum is σ = 154103040. Its totient is φ = 34428672.

The previous prime is 78115607. The next prime is 78115643. The reversal of 78115612 is 21651187.

It is a super-2 number, since 2×78115612² = 12204097676269088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132783 + ... + 133369.

It is an arithmetic number, because the mean of its divisors is an integer number (3210480).

Almost surely, 2^78115612 is an apocalyptic number.

It is an amenable number.

78115612 is a deficient number, since it is larger than the sum of its proper divisors (75987428).

78115612 is a wasteful number, since it uses less digits than its factorization.

78115612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 728 counting only the distinct ones).

The product of its digits is 3360, while the sum is 31.

The square root of 78115612 is about 8838.3036833999. The cubic root of 78115612 is about 427.4768625121.

Adding to 78115612 its reverse (21651187), we get a palindrome (99766799).

The spelling of 78115612 in words is "seventy-eight million, one hundred fifteen thousand, six hundred twelve".