678731834 has 48 divisors (see below), whose sum is σ = 1225967400. Its totient is φ = 280304640.

The previous prime is 678731827. The next prime is 678731843. The reversal of 678731834 is 438137876.

It can be written as a sum of positive squares in 4 ways, for example, as 676780225 + 1951609 = 26015^2 + 1397^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116462 + ... + 122150.

Almost surely, 2^678731834 is an apocalyptic number.

678731834 is a deficient number, since it is larger than the sum of its proper divisors (547235566).

678731834 is a wasteful number, since it uses less digits than its factorization.

678731834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5759 (or 5748 counting only the distinct ones).

The product of its digits is 677376, while the sum is 47.

The square root of 678731834 is about 26052.4823001571. The cubic root of 678731834 is about 878.8189364161.

The spelling of 678731834 in words is "six hundred seventy-eight million, seven hundred thirty-one thousand, eight hundred thirty-four".