78891923 has 16 divisors (see below), whose sum is σ = 87609600. Its totient is φ = 70445280.

The previous prime is 78891907. The next prime is 78891929. The reversal of 78891923 is 32919887.

It is a cyclic number.

It is not a de Polignac number, because 78891923 - 2⁴ = 78891907 is a prime.

It is a super-3 number, since 3×78891923³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78891929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202613 + ... + 203001.

It is an arithmetic number, because the mean of its divisors is an integer number (5475600).

Almost surely, 2^78891923 is an apocalyptic number.

78891923 is a deficient number, since it is larger than the sum of its proper divisors (8717677).

78891923 is a wasteful number, since it uses less digits than its factorization.

78891923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682.

The product of its digits is 217728, while the sum is 47.

The square root of 78891923 is about 8882.1125302486. The cubic root of 78891923 is about 428.8882820286. Note that the first 3 decimals are identical.

The spelling of 78891923 in words is "seventy-eight million, eight hundred ninety-one thousand, nine hundred twenty-three".