78423879 has 8 divisors (see below), whose sum is σ = 104637040. Its totient is φ = 52246656.

The previous prime is 78423833. The next prime is 78423883. The reversal of 78423879 is 97832487.

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

It is not a de Polignac number, because 78423879 - 2¹⁷ = 78292807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78423809) 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, 3394 + ... + 12975.

It is an arithmetic number, because the mean of its divisors is an integer number (13079630).

Almost surely, 2^78423879 is an apocalyptic number.

78423879 is a deficient number, since it is larger than the sum of its proper divisors (26213161).

78423879 is a wasteful number, since it uses less digits than its factorization.

78423879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17969.

The product of its digits is 677376, while the sum is 48.

The square root of 78423879 is about 8855.7257748871. The cubic root of 78423879 is about 428.0384405891.

The spelling of 78423879 in words is "seventy-eight million, four hundred twenty-three thousand, eight hundred seventy-nine".