691801768 has 32 divisors (see below), whose sum is σ = 1487741760. Its totient is φ = 295424640.

The previous prime is 691801741. The next prime is 691801807. The reversal of 691801768 is 867108196.

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, 6246 + ... + 37717.

It is an arithmetic number, because the mean of its divisors is an integer number (46491930).

Almost surely, 2^691801768 is an apocalyptic number.

It is an amenable number.

691801768 is an abundant number, since it is smaller than the sum of its proper divisors (795939992).

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

691801768 is a wasteful number, since it uses less digits than its factorization.

691801768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44257 (or 44253 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 691801768 is about 26302.1247810895. The cubic root of 691801768 is about 884.4240746290.

The spelling of 691801768 in words is "six hundred ninety-one million, eight hundred one thousand, seven hundred sixty-eight".