78431968 has 12 divisors (see below), whose sum is σ = 154413000. Its totient is φ = 39215968.

The previous prime is 78431933. The next prime is 78431987. The reversal of 78431968 is 86913487.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1225468 + ... + 1225531.

It is an arithmetic number, because the mean of its divisors is an integer number (12867750).

Almost surely, 2^78431968 is an apocalyptic number.

It is an amenable number.

78431968 is a deficient number, since it is larger than the sum of its proper divisors (75981032).

78431968 is a wasteful number, since it uses less digits than its factorization.

78431968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451009 (or 2451001 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 78431968 is about 8856.1824732782. The cubic root of 78431968 is about 428.0531567017.

The spelling of 78431968 in words is "seventy-eight million, four hundred thirty-one thousand, nine hundred sixty-eight".