78023889 has 12 divisors (see below), whose sum is σ = 117601536. Its totient is φ = 49754232.

The previous prime is 78023879. The next prime is 78023893. The reversal of 78023889 is 98832087.

It is not a de Polignac number, because 78023889 - 2⁴ = 78023873 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (78023879) 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, 188257 + ... + 188670.

It is an arithmetic number, because the mean of its divisors is an integer number (9800128).

Almost surely, 2^78023889 is an apocalyptic number.

It is an amenable number.

78023889 is a deficient number, since it is larger than the sum of its proper divisors (39577647).

78023889 is a wasteful number, since it uses less digits than its factorization.

78023889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376956 (or 376953 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 78023889 is about 8833.1132110938. The cubic root of 78023889 is about 427.3094831804.

The spelling of 78023889 in words is "seventy-eight million, twenty-three thousand, eight hundred eighty-nine".