78765513 has 16 divisors (see below), whose sum is σ = 108658176. Its totient is φ = 50699520.

The previous prime is 78765509. The next prime is 78765517. The reversal of 78765513 is 31556787.

It is an interprime number because it is at equal distance from previous prime (78765509) and next prime (78765517).

It is not a de Polignac number, because 78765513 - 2² = 78765509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78765517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60081 + ... + 61377.

It is an arithmetic number, because the mean of its divisors is an integer number (6791136).

Almost surely, 2^78765513 is an apocalyptic number.

It is an amenable number.

78765513 is a deficient number, since it is larger than the sum of its proper divisors (29892663).

78765513 is a wasteful number, since it uses less digits than its factorization.

78765513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984.

The product of its digits is 176400, while the sum is 42.

The square root of 78765513 is about 8874.9936901386. The cubic root of 78765513 is about 428.6590876723.

The spelling of 78765513 in words is "seventy-eight million, seven hundred sixty-five thousand, five hundred thirteen".