812678864478 has 32 divisors (see below), whose sum is σ = 1780052803200. Its totient is φ = 245816812896.

The previous prime is 812678864477. The next prime is 812678864531. The reversal of 812678864478 is 874468876218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812678864477) 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, 88291668 + ... + 88300871.

It is an arithmetic number, because the mean of its divisors is an integer number (55626650100).

Almost surely, 2^812678864478 is an apocalyptic number.

812678864478 is an abundant number, since it is smaller than the sum of its proper divisors (967373938722).

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

812678864478 is a wasteful number, since it uses less digits than its factorization.

812678864478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176592616.

The product of its digits is 231211008, while the sum is 69.

The spelling of 812678864478 in words is "eight hundred twelve billion, six hundred seventy-eight million, eight hundred sixty-four thousand, four hundred seventy-eight".