691376868 has 288 divisors, whose sum is σ = 2262624000. Its totient is φ = 176795136.

The previous prime is 691376843. The next prime is 691376879. The reversal of 691376868 is 868673196.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9470880 + ... + 9470952.

Almost surely, 2^691376868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691376868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1131312000).

691376868 is an abundant number, since it is smaller than the sum of its proper divisors (1571247132).

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

691376868 is a wasteful number, since it uses less digits than its factorization.

691376868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 157 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 691376868 is about 26294.0462462513. The cubic root of 691376868 is about 884.2429684369.

The spelling of 691376868 in words is "six hundred ninety-one million, three hundred seventy-six thousand, eight hundred sixty-eight".