691689004 has 24 divisors (see below), whose sum is σ = 1235771600. Its totient is φ = 338662080.

The previous prime is 691688969. The next prime is 691689007. The reversal of 691689004 is 400986196.

It is not an unprimeable number, because it can be changed into a prime (691689007) 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, 49687 + ... + 62065.

Almost surely, 2^691689004 is an apocalyptic number.

It is an amenable number.

691689004 is a deficient number, since it is larger than the sum of its proper divisors (544082596).

691689004 is a wasteful number, since it uses less digits than its factorization.

691689004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12673 (or 12671 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 691689004 is about 26299.9810646320. The cubic root of 691689004 is about 884.3760181769.

The spelling of 691689004 in words is "six hundred ninety-one million, six hundred eighty-nine thousand, four".