78876665 has 16 divisors (see below), whose sum is σ = 111905280. Its totient is φ = 52221120.

The previous prime is 78876659. The next prime is 78876671. The reversal of 78876665 is 56667887.

It is an interprime number because it is at equal distance from previous prime (78876659) and next prime (78876671).

It is not a de Polignac number, because 78876665 - 2¹⁶ = 78811129 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37841 + ... + 39870.

It is an arithmetic number, because the mean of its divisors is an integer number (6994080).

Almost surely, 2^78876665 is an apocalyptic number.

It is an amenable number.

78876665 is a deficient number, since it is larger than the sum of its proper divisors (33028615).

78876665 is a wasteful number, since it uses less digits than its factorization.

78876665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77752.

The product of its digits is 3386880, while the sum is 53.

The square root of 78876665 is about 8881.2535714279. The cubic root of 78876665 is about 428.8606307005.

The spelling of 78876665 in words is "seventy-eight million, eight hundred seventy-six thousand, six hundred sixty-five".