891688 has 16 divisors (see below), whose sum is σ = 1910880. Its totient is φ = 382128.

The previous prime is 891679. The next prime is 891707. The reversal of 891688 is 886198.

It is a happy number.

891688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 891688.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7906 + ... + 8017.

It is an arithmetic number, because the mean of its divisors is an integer number (119430).

2⁸⁹¹⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

891688 is an abundant number, since it is smaller than the sum of its proper divisors (1019192).

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

891688 is a wasteful number, since it uses less digits than its factorization.

891688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15936 (or 15932 counting only the distinct ones).

The product of its digits is 27648, while the sum is 40.

The square root of 891688 is about 944.2923276189. The cubic root of 891688 is about 96.2507910207.

The spelling of 891688 in words is "eight hundred ninety-one thousand, six hundred eighty-eight".