78431924 has 12 divisors (see below), whose sum is σ = 144480000. Its totient is φ = 37151928.

The previous prime is 78431917. The next prime is 78431933. The reversal of 78431924 is 42913487.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515924 + ... + 516075.

It is an arithmetic number, because the mean of its divisors is an integer number (12040000).

Almost surely, 2^78431924 is an apocalyptic number.

It is an amenable number.

78431924 is a deficient number, since it is larger than the sum of its proper divisors (66048076).

78431924 is a wasteful number, since it uses less digits than its factorization.

78431924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032022 (or 1032020 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 78431924 is about 8856.1799891375. The cubic root of 78431924 is about 428.0530766564.

The spelling of 78431924 in words is "seventy-eight million, four hundred thirty-one thousand, nine hundred twenty-four".