78791615 has 32 divisors (see below), whose sum is σ = 112803840. Its totient is φ = 51696000.

The previous prime is 78791593. The next prime is 78791621. The reversal of 78791615 is 51619787.

It is not a de Polignac number, because 78791615 - 2⁸ = 78791359 is a prime.

It is a plaindrome in base 12.

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, 109226 + ... + 109944.

It is an arithmetic number, because the mean of its divisors is an integer number (3525120).

Almost surely, 2^78791615 is an apocalyptic number.

78791615 is a deficient number, since it is larger than the sum of its proper divisors (34012225).

78791615 is a wasteful number, since it uses less digits than its factorization.

78791615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863.

The product of its digits is 105840, while the sum is 44.

The square root of 78791615 is about 8876.4641045858. The cubic root of 78791615 is about 428.7064333670.

The spelling of 78791615 in words is "seventy-eight million, seven hundred ninety-one thousand, six hundred fifteen".