78765681 has 8 divisors (see below), whose sum is σ = 105266304. Its totient is φ = 52387760.

The previous prime is 78765647. The next prime is 78765683. The reversal of 78765681 is 18656787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78765681 - 2²⁵ = 45211249 is a prime.

It is a super-2 number, since 2×78765681² = 12408065006787522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78765681.

It is not an unprimeable number, because it can be changed into a prime (78765683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29166 + ... + 31751.

It is an arithmetic number, because the mean of its divisors is an integer number (13158288).

Almost surely, 2^78765681 is an apocalyptic number.

It is an amenable number.

78765681 is a deficient number, since it is larger than the sum of its proper divisors (26500623).

78765681 is a wasteful number, since it uses less digits than its factorization.

78765681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61351.

The product of its digits is 564480, while the sum is 48.

The square root of 78765681 is about 8875.0031549290. The cubic root of 78765681 is about 428.6593924363.

The spelling of 78765681 in words is "seventy-eight million, seven hundred sixty-five thousand, six hundred eighty-one".