891720 has 48 divisors (see below), whose sum is σ = 2899260. Its totient is φ = 237696.

The previous prime is 891707. The next prime is 891743. The reversal of 891720 is 27198.

891720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 887364 + 4356 = 942^2 + 66^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 879 + ... + 1598.

2⁸⁹¹⁷²⁰ is an apocalyptic number.

It is an amenable number.

891720 is an abundant number, since it is smaller than the sum of its proper divisors (2007540).

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

891720 is a wasteful number, since it uses less digits than its factorization.

891720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494 (or 2487 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 891720 is about 944.3092713725. The cubic root of 891720 is about 96.2519423907.

The spelling of 891720 in words is "eight hundred ninety-one thousand, seven hundred twenty".