891377172 has 144 divisors (see below), whose sum is σ = 2744501760. Its totient is φ = 238261824.

The previous prime is 891377159. The next prime is 891377183. The reversal of 891377172 is 271773198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 396283 + ... + 398525.

It is an arithmetic number, because the mean of its divisors is an integer number (19059040).

Almost surely, 2^891377172 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 891377172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1372250880).

891377172 is an abundant number, since it is smaller than the sum of its proper divisors (1853124588).

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

891377172 is a wasteful number, since it uses less digits than its factorization.

891377172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362 (or 2357 counting only the distinct ones).

The product of its digits is 148176, while the sum is 45.

The square root of 891377172 is about 29855.9403134452. The cubic root of 891377172 is about 962.3960589843.

The spelling of 891377172 in words is "eight hundred ninety-one million, three hundred seventy-seven thousand, one hundred seventy-two".