891638852 has 48 divisors (see below), whose sum is σ = 1702377600. Its totient is φ = 406183680.

The previous prime is 891638837. The next prime is 891638873. The reversal of 891638852 is 258836198.

It is a self number, because there is not a number n which added to its sum of digits gives 891638852.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2030849 + ... + 2031287.

It is an arithmetic number, because the mean of its divisors is an integer number (35466200).

Almost surely, 2^891638852 is an apocalyptic number.

It is an amenable number.

891638852 is a deficient number, since it is larger than the sum of its proper divisors (810738748).

891638852 is a wasteful number, since it uses less digits than its factorization.

891638852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876 (or 874 counting only the distinct ones).

The product of its digits is 829440, while the sum is 50.

The square root of 891638852 is about 29860.3223693248. The cubic root of 891638852 is about 962.4902260659.

The spelling of 891638852 in words is "eight hundred ninety-one million, six hundred thirty-eight thousand, eight hundred fifty-two".