78131256 has 32 divisors (see below), whose sum is σ = 223232640. Its totient is φ = 22323168.

The previous prime is 78131239. The next prime is 78131257. The reversal of 78131256 is 65213187.

It is a super-2 number, since 2×78131256² = 12208986328275072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78131257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232366 + ... + 232701.

It is an arithmetic number, because the mean of its divisors is an integer number (6976020).

Almost surely, 2^78131256 is an apocalyptic number.

It is an amenable number.

78131256 is an abundant number, since it is smaller than the sum of its proper divisors (145101384).

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

78131256 is a wasteful number, since it uses less digits than its factorization.

78131256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465083 (or 465079 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 78131256 is about 8839.1886505493. The cubic root of 78131256 is about 427.5053971481.

It can be divided in two parts, 78131 and 256, that added together give a palindrome (78387).

The spelling of 78131256 in words is "seventy-eight million, one hundred thirty-one thousand, two hundred fifty-six".