891440368 has 160 divisors (see below), whose sum is σ = 2213608320. Its totient is φ = 338411520.

The previous prime is 891440359. The next prime is 891440377. The reversal of 891440368 is 863044198.

It is an interprime number because it is at equal distance from previous prime (891440359) and next prime (891440377).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6506796 + ... + 6506932.

It is an arithmetic number, because the mean of its divisors is an integer number (13835052).

Almost surely, 2^891440368 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 891440368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1106804160).

891440368 is an abundant number, since it is smaller than the sum of its proper divisors (1322167952).

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

891440368 is a wasteful number, since it uses less digits than its factorization.

891440368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 891440368 is about 29856.9986435341. The cubic root of 891440368 is about 962.4188021231.

The spelling of 891440368 in words is "eight hundred ninety-one million, four hundred forty thousand, three hundred sixty-eight".