78673923 has 18 divisors (see below), whose sum is σ = 118056484. Its totient is φ = 52357104.

The previous prime is 78673913. The next prime is 78673949. The reversal of 78673923 is 32937687.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 78673923 - 2⁵ = 78673891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78673913) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 137983 + ... + 138551.

Almost surely, 2^78673923 is an apocalyptic number.

78673923 is a deficient number, since it is larger than the sum of its proper divisors (39382561).

78673923 is an frugal number, since it uses more digits than its factorization.

78673923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153 (or 572 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 78673923 is about 8869.8321855602. The cubic root of 78673923 is about 428.4928723160.

The spelling of 78673923 in words is "seventy-eight million, six hundred seventy-three thousand, nine hundred twenty-three".