678512831794 has 16 divisors (see below), whose sum is σ = 1163887804800. Its totient is φ = 290610476064.

The previous prime is 678512831779. The next prime is 678512831803. The reversal of 678512831794 is 497138215876.

678512831794 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×678512831794² (a number of 24 digits) contains 22 as substring.

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, 15038134 + ... + 15083185.

It is an arithmetic number, because the mean of its divisors is an integer number (72742987800).

Almost surely, 2^678512831794 is an apocalyptic number.

678512831794 is a deficient number, since it is larger than the sum of its proper divisors (485374973006).

678512831794 is a wasteful number, since it uses less digits than its factorization.

678512831794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30122937.

The product of its digits is 20321280, while the sum is 61.

The spelling of 678512831794 in words is "six hundred seventy-eight billion, five hundred twelve million, eight hundred thirty-one thousand, seven hundred ninety-four".