12856578 has 32 divisors (see below), whose sum is σ = 30935040. Its totient is φ = 3479760.

The previous prime is 12856567. The next prime is 12856579. The reversal of 12856578 is 87565821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (12856579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7258 + ... + 8853.

It is an arithmetic number, because the mean of its divisors is an integer number (966720).

Almost surely, 2^12856578 is an apocalyptic number.

12856578 is an abundant number, since it is smaller than the sum of its proper divisors (18078462).

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

12856578 is a wasteful number, since it uses less digits than its factorization.

12856578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16142.

The product of its digits is 134400, while the sum is 42.

The square root of 12856578 is about 3585.6070615727. The cubic root of 12856578 is about 234.2655688961.

The spelling of 12856578 in words is "twelve million, eight hundred fifty-six thousand, five hundred seventy-eight".