78857256 has 16 divisors (see below), whose sum is σ = 197143200. Its totient is φ = 26285744.

The previous prime is 78857231. The next prime is 78857257. The reversal of 78857256 is 65275887.

It is not an unprimeable number, because it can be changed into a prime (78857257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1642836 + ... + 1642883.

It is an arithmetic number, because the mean of its divisors is an integer number (12321450).

Almost surely, 2^78857256 is an apocalyptic number.

It is an amenable number.

78857256 is an abundant number, since it is smaller than the sum of its proper divisors (118285944).

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

78857256 is a wasteful number, since it uses less digits than its factorization.

78857256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3285728 (or 3285724 counting only the distinct ones).

The product of its digits is 940800, while the sum is 48.

The square root of 78857256 is about 8880.1608093547. The cubic root of 78857256 is about 428.8254515644.

The spelling of 78857256 in words is "seventy-eight million, eight hundred fifty-seven thousand, two hundred fifty-six".