78269823 has 12 divisors (see below), whose sum is σ = 116703808. Its totient is φ = 50496480.

The previous prime is 78269809. The next prime is 78269831. The reversal of 78269823 is 32896287.

It is not a de Polignac number, because 78269823 - 2⁵ = 78269791 is a prime.

It is a super-2 number, since 2×78269823² = 12252330384902658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78269833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139990 + ... + 140547.

Almost surely, 2^78269823 is an apocalyptic number.

78269823 is a deficient number, since it is larger than the sum of its proper divisors (38433985).

78269823 is a wasteful number, since it uses less digits than its factorization.

78269823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280574 (or 280571 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 78269823 is about 8847.0233977310. The cubic root of 78269823 is about 427.7579770499.

The spelling of 78269823 in words is "seventy-eight million, two hundred sixty-nine thousand, eight hundred twenty-three".