691906872 has 16 divisors (see below), whose sum is σ = 1729767240. Its totient is φ = 230635616.

The previous prime is 691906871. The next prime is 691906883. The reversal of 691906872 is 278609196.

691906872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691906871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14414703 + ... + 14414750.

Almost surely, 2^691906872 is an apocalyptic number.

It is an amenable number.

691906872 is an abundant number, since it is smaller than the sum of its proper divisors (1037860368).

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

691906872 is a wasteful number, since it uses less digits than its factorization.

691906872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28829462 (or 28829458 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 691906872 is about 26304.1227186918. The cubic root of 691906872 is about 884.4688619294.

The spelling of 691906872 in words is "six hundred ninety-one million, nine hundred six thousand, eight hundred seventy-two".