78736873 has 4 divisors (see below), whose sum is σ = 79516548. Its totient is φ = 77957200.

The previous prime is 78736849. The next prime is 78736883. The reversal of 78736873 is 37863787.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41319184 + 37417689 = 6428^2 + 6117^2 .

It is a cyclic number.

It is not a de Polignac number, because 78736873 - 2²⁵ = 45182441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78736813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389686 + ... + 389887.

It is an arithmetic number, because the mean of its divisors is an integer number (19879137).

Almost surely, 2^78736873 is an apocalyptic number.

It is an amenable number.

78736873 is a deficient number, since it is larger than the sum of its proper divisors (779675).

78736873 is a wasteful number, since it uses less digits than its factorization.

78736873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779674.

The product of its digits is 1185408, while the sum is 49.

The square root of 78736873 is about 8873.3800211644. The cubic root of 78736873 is about 428.6071263334.

The spelling of 78736873 in words is "seventy-eight million, seven hundred thirty-six thousand, eight hundred seventy-three".