891730944 has 220 divisors, whose sum is σ = 2871187704. Its totient is φ = 274046976.

The previous prime is 891730921. The next prime is 891730949. The reversal of 891730944 is 449037198.

It is a super-2 number, since 2×891730944² = 1590368152974262272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 891730944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891730949) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1077859 + ... + 1078685.

Almost surely, 2^891730944 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 891730944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1435593852).

891730944 is an abundant number, since it is smaller than the sum of its proper divisors (1979456760).

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

891730944 is a wasteful number, since it uses less digits than its factorization.

891730944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872 (or 845 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 891730944 is about 29861.8643758222. The cubic root of 891730944 is about 962.5233615289.

The spelling of 891730944 in words is "eight hundred ninety-one million, seven hundred thirty thousand, nine hundred forty-four".