891680 has 24 divisors (see below), whose sum is σ = 2106972. Its totient is φ = 356608.

The previous prime is 891679. The next prime is 891707. The reversal of 891680 is 86198.

It can be written as a sum of positive squares in 2 ways, for example, as 781456 + 110224 = 884^2 + 332^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 2627 + ... + 2946.

2⁸⁹¹⁶⁸⁰ is an apocalyptic number.

891680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

891680 is an abundant number, since it is smaller than the sum of its proper divisors (1215292).

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

891680 is a wasteful number, since it uses less digits than its factorization.

891680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5588 (or 5580 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 891680 is about 944.2880916331. The cubic root of 891680 is about 96.2505031738.

The spelling of 891680 in words is "eight hundred ninety-one thousand, six hundred eighty".