694139864 has 16 divisors (see below), whose sum is σ = 1419831720. Its totient is φ = 315518080.

The previous prime is 694139833. The next prime is 694139917. The reversal of 694139864 is 468931496.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3943889 + ... + 3944064.

Almost surely, 2^694139864 is an apocalyptic number.

It is an amenable number.

694139864 is an abundant number, since it is smaller than the sum of its proper divisors (725691856).

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

694139864 is a wasteful number, since it uses less digits than its factorization.

694139864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7887970 (or 7887966 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 50.

The square root of 694139864 is about 26346.5341933242. The cubic root of 694139864 is about 885.4193227121.

The spelling of 694139864 in words is "six hundred ninety-four million, one hundred thirty-nine thousand, eight hundred sixty-four".