12640578 has 16 divisors (see below), whose sum is σ = 26153280. Its totient is φ = 4068176.

The previous prime is 12640561. The next prime is 12640601. The reversal of 12640578 is 87504621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36150 + ... + 36497.

It is an arithmetic number, because the mean of its divisors is an integer number (1634580).

Almost surely, 2^12640578 is an apocalyptic number.

12640578 is an abundant number, since it is smaller than the sum of its proper divisors (13512702).

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

12640578 is a wasteful number, since it uses less digits than its factorization.

12640578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72681.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 12640578 is about 3555.3590535978. The cubic root of 12640578 is about 232.9462075037.

It can be divided in two parts, 126 and 40578, that added together give a palindrome (40704).

The spelling of 12640578 in words is "twelve million, six hundred forty thousand, five hundred seventy-eight".