678979694 has 16 divisors (see below), whose sum is σ = 1086145200. Its totient is φ = 317218944.

The previous prime is 678979667. The next prime is 678979699. The reversal of 678979694 is 496979876.

It is a super-2 number, since 2×678979694² = 922026849728667272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 678979694.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678979699) 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, 67109 + ... + 76560.

It is an arithmetic number, because the mean of its divisors is an integer number (67884075).

Almost surely, 2^678979694 is an apocalyptic number.

678979694 is a deficient number, since it is larger than the sum of its proper divisors (407165506).

678979694 is a wasteful number, since it uses less digits than its factorization.

678979694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143827.

The product of its digits is 41150592, while the sum is 65.

The square root of 678979694 is about 26057.2388022983. The cubic root of 678979694 is about 878.9258994026.

The spelling of 678979694 in words is "six hundred seventy-eight million, nine hundred seventy-nine thousand, six hundred ninety-four".