891199688 has 16 divisors (see below), whose sum is σ = 1671425280. Its totient is φ = 445486288.

The previous prime is 891199669. The next prime is 891199703. The reversal of 891199688 is 886991198.

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 3 ways as a sum of consecutive naturals, for example, 25781 + ... + 49467.

It is an arithmetic number, because the mean of its divisors is an integer number (104464080).

Almost surely, 2^891199688 is an apocalyptic number.

It is an amenable number.

891199688 is a deficient number, since it is larger than the sum of its proper divisors (780225592).

891199688 is a wasteful number, since it uses less digits than its factorization.

891199688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28396 (or 28392 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 59.

The square root of 891199688 is about 29852.9678256618. The cubic root of 891199688 is about 962.3321798373.

The spelling of 891199688 in words is "eight hundred ninety-one million, one hundred ninety-nine thousand, six hundred eighty-eight".