891643872 has 192 divisors, whose sum is σ = 2788853760. Its totient is φ = 244145664.

The previous prime is 891643859. The next prime is 891643873. The reversal of 891643872 is 278346198.

891643872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891643873) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1704603 + ... + 1705125.

It is an arithmetic number, because the mean of its divisors is an integer number (14525280).

Almost surely, 2^891643872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891643872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1394426880).

891643872 is an abundant number, since it is smaller than the sum of its proper divisors (1897209888).

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

891643872 is a wasteful number, since it uses less digits than its factorization.

891643872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 637 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 891643872 is about 29860.4064272407. The cubic root of 891643872 is about 962.4920323622.

The spelling of 891643872 in words is "eight hundred ninety-one million, six hundred forty-three thousand, eight hundred seventy-two".