78431936 has 28 divisors (see below), whose sum is σ = 169788840. Its totient is φ = 35650560.

The previous prime is 78431933. The next prime is 78431987. The reversal of 78431936 is 63913487.

It is a junction number, because it is equal to n+sod(n) for n = 78431893 and 78431902.

It is not an unprimeable number, because it can be changed into a prime (78431933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55001 + ... + 56408.

Almost surely, 2^78431936 is an apocalyptic number.

It is an amenable number.

78431936 is an abundant number, since it is smaller than the sum of its proper divisors (91356904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78431936 is a wasteful number, since it uses less digits than its factorization.

78431936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111432 (or 111422 counting only the distinct ones).

The product of its digits is 108864, while the sum is 41.

The square root of 78431936 is about 8856.1806666305. The cubic root of 78431936 is about 428.0530984869.

It can be divided in two parts, 7843 and 1936, that added together give a palindrome (9779).

The spelling of 78431936 in words is "seventy-eight million, four hundred thirty-one thousand, nine hundred thirty-six".