678729794 has 12 divisors (see below), whose sum is σ = 1081506354. Its totient is φ = 319401984.

The previous prime is 678729787. The next prime is 678729803. The reversal of 678729794 is 497927876.

It can be written as a sum of positive squares in 3 ways, for example, as 619362769 + 59367025 = 24887^2 + 7705^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586559 + ... + 587714.

Almost surely, 2^678729794 is an apocalyptic number.

678729794 is a deficient number, since it is larger than the sum of its proper divisors (402776560).

678729794 is a wasteful number, since it uses less digits than its factorization.

678729794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174309 (or 1174292 counting only the distinct ones).

The product of its digits is 10668672, while the sum is 59.

The square root of 678729794 is about 26052.4431483882. The cubic root of 678729794 is about 878.8180559543.

The spelling of 678729794 in words is "six hundred seventy-eight million, seven hundred twenty-nine thousand, seven hundred ninety-four".