691945876 has 12 divisors (see below), whose sum is σ = 1274637280. Its totient is φ = 327763800.

The previous prime is 691945871. The next prime is 691945879. The reversal of 691945876 is 678549196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691945871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4552200 + ... + 4552351.

Almost surely, 2^691945876 is an apocalyptic number.

It is an amenable number.

691945876 is a deficient number, since it is larger than the sum of its proper divisors (582691404).

691945876 is a wasteful number, since it uses less digits than its factorization.

691945876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9104574 (or 9104572 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 55.

The square root of 691945876 is about 26304.8641129355. The cubic root of 691945876 is about 884.4854813025.

The spelling of 691945876 in words is "six hundred ninety-one million, nine hundred forty-five thousand, eight hundred seventy-six".