691397168 has 40 divisors (see below), whose sum is σ = 1670131200. Its totient is φ = 269375040.

The previous prime is 691397143. The next prime is 691397209. The reversal of 691397168 is 861793196.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 279368 + ... + 281831.

It is an arithmetic number, because the mean of its divisors is an integer number (41753280).

Almost surely, 2^691397168 is an apocalyptic number.

It is an amenable number.

691397168 is an abundant number, since it is smaller than the sum of its proper divisors (978734032).

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

691397168 is a wasteful number, since it uses less digits than its factorization.

691397168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561225 (or 561219 counting only the distinct ones).

The product of its digits is 489888, while the sum is 50.

The square root of 691397168 is about 26294.4322623631. The cubic root of 691397168 is about 884.2516226443.

The spelling of 691397168 in words is "six hundred ninety-one million, three hundred ninety-seven thousand, one hundred sixty-eight".