1312578478 has 16 divisors (see below), whose sum is σ = 2023146144. Its totient is φ = 638215200.

The previous prime is 1312578451. The next prime is 1312578479. The reversal of 1312578478 is 8748752131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312578479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192528 + ... + 199228.

It is an arithmetic number, because the mean of its divisors is an integer number (126446634).

Almost surely, 2^1312578478 is an apocalyptic number.

1312578478 is a deficient number, since it is larger than the sum of its proper divisors (710567666).

1312578478 is a wasteful number, since it uses less digits than its factorization.

1312578478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9387.

The product of its digits is 376320, while the sum is 46.

The square root of 1312578478 is about 36229.5249485830. The cubic root of 1312578478 is about 1094.9016064992.

The spelling of 1312578478 in words is "one billion, three hundred twelve million, five hundred seventy-eight thousand, four hundred seventy-eight".