891092992 has 34 divisors (see below), whose sum is σ = 1782303458. Its totient is φ = 445513728.

The previous prime is 891092959. The next prime is 891093001. The reversal of 891092992 is 299290198.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 579076096 + 312016896 = 24064^2 + 17664^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58738 + ... + 72334.

Almost surely, 2^891092992 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 891092992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891151729).

891092992 is an abundant number, since it is smaller than the sum of its proper divisors (891210466).

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

891092992 is an frugal number, since it uses more digits than its factorization.

891092992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13629 (or 13599 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 891092992 is about 29851.1807471664. The cubic root of 891092992 is about 962.2937742688.

The spelling of 891092992 in words is "eight hundred ninety-one million, ninety-two thousand, nine hundred ninety-two".