12564478 has 8 divisors (see below), whose sum is σ = 18874440. Its totient is φ = 6273000.

The previous prime is 12564467. The next prime is 12564481. The reversal of 12564478 is 87446521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12564478² = 315732214824968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2773 + ... + 5728.

It is an arithmetic number, because the mean of its divisors is an integer number (2359305).

Almost surely, 2^12564478 is an apocalyptic number.

12564478 is a deficient number, since it is larger than the sum of its proper divisors (6309962).

12564478 is an equidigital number, since it uses as much as digits as its factorization.

12564478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9242.

The product of its digits is 53760, while the sum is 37.

The square root of 12564478 is about 3544.6407434323. The cubic root of 12564478 is about 232.4777980110.

The spelling of 12564478 in words is "twelve million, five hundred sixty-four thousand, four hundred seventy-eight".