78431256 has 48 divisors (see below), whose sum is σ = 212846400. Its totient is φ = 26091072.

The previous prime is 78431239. The next prime is 78431257. The reversal of 78431256 is 65213487.

It is a super-3 number, since 3×78431256³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 78431256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78431257) 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, 53785 + ... + 55223.

It is an arithmetic number, because the mean of its divisors is an integer number (4434300).

Almost surely, 2^78431256 is an apocalyptic number.

It is an amenable number.

78431256 is an abundant number, since it is smaller than the sum of its proper divisors (134415144).

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

78431256 is a wasteful number, since it uses less digits than its factorization.

78431256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208 (or 2201 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 78431256 is about 8856.1422752799. The cubic root of 78431256 is about 428.0518614188.

It can be divided in two parts, 78431 and 256, that added together give a palindrome (78687).

The spelling of 78431256 in words is "seventy-eight million, four hundred thirty-one thousand, two hundred fifty-six".