78408123 has 4 divisors (see below), whose sum is σ = 104544168. Its totient is φ = 52272080.

The previous prime is 78408103. The next prime is 78408137. The reversal of 78408123 is 32180487.

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 78408123 - 2⁵ = 78408091 is a prime.

It is a super-2 number, since 2×78408123² = 12295667504766258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78408103) 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, 13068018 + ... + 13068023.

It is an arithmetic number, because the mean of its divisors is an integer number (26136042).

Almost surely, 2^78408123 is an apocalyptic number.

78408123 is a deficient number, since it is larger than the sum of its proper divisors (26136045).

78408123 is a wasteful number, since it uses less digits than its factorization.

78408123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26136044.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 78408123 is about 8854.8361362591. The cubic root of 78408123 is about 428.0097731923.

The spelling of 78408123 in words is "seventy-eight million, four hundred eight thousand, one hundred twenty-three".