12578643 has 36 divisors (see below), whose sum is σ = 23065848. Its totient is φ = 6531840.

The previous prime is 12578611. The next prime is 12578681. The reversal of 12578643 is 34687521.

12578643 is a `hidden beast` number, since 1 + 2 + 5 + 7 + 8 + 643 = 666.

It is not a de Polignac number, because 12578643 - 2⁵ = 12578611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12578598 and 12578607.

It is not an unprimeable number, because it can be changed into a prime (12578603) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3555 + ... + 6147.

It is an arithmetic number, because the mean of its divisors is an integer number (640718).

Almost surely, 2^12578643 is an apocalyptic number.

12578643 is a deficient number, since it is larger than the sum of its proper divisors (10487205).

12578643 is a wasteful number, since it uses less digits than its factorization.

12578643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624 (or 2614 counting only the distinct ones).

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

The square root of 12578643 is about 3546.6382674302. The cubic root of 12578643 is about 232.5651291698.

The spelling of 12578643 in words is "twelve million, five hundred seventy-eight thousand, six hundred forty-three".