78911123 has 4 divisors (see below), whose sum is σ = 83064360. Its totient is φ = 74757888.

The previous prime is 78911099. The next prime is 78911191. The reversal of 78911123 is 32111987.

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 78911123 - 2¹⁰ = 78910099 is a prime.

It is a super-2 number, since 2×78911123² = 12453930666242258, which contains 22 as substring.

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 78911123.

It is not an unprimeable number, because it can be changed into a prime (78911423) 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, 2076590 + ... + 2076627.

It is an arithmetic number, because the mean of its divisors is an integer number (20766090).

Almost surely, 2^78911123 is an apocalyptic number.

78911123 is a deficient number, since it is larger than the sum of its proper divisors (4153237).

78911123 is a wasteful number, since it uses less digits than its factorization.

78911123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4153236.

The product of its digits is 3024, while the sum is 32.

The square root of 78911123 is about 8883.1932884521. The cubic root of 78911123 is about 428.9230721852.

The spelling of 78911123 in words is "seventy-eight million, nine hundred eleven thousand, one hundred twenty-three".