78872399 has 4 divisors (see below), whose sum is σ = 79126320. Its totient is φ = 78618480.

The previous prime is 78872393. The next prime is 78872411. The reversal of 78872399 is 99327887.

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

It is a cyclic number.

It is not a de Polignac number, because 78872399 - 2²⁴ = 62095183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78872399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78872393) 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, 126494 + ... + 127115.

It is an arithmetic number, because the mean of its divisors is an integer number (19781580).

Almost surely, 2^78872399 is an apocalyptic number.

78872399 is a deficient number, since it is larger than the sum of its proper divisors (253921).

78872399 is a wasteful number, since it uses less digits than its factorization.

78872399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253920.

The product of its digits is 1524096, while the sum is 53.

The square root of 78872399 is about 8881.0133993819. The cubic root of 78872399 is about 428.8528989993.

The spelling of 78872399 in words is "seventy-eight million, eight hundred seventy-two thousand, three hundred ninety-nine".