891009312 has 48 divisors (see below), whose sum is σ = 2341120320. Its totient is φ = 296721152.

The previous prime is 891009299. The next prime is 891009331. The reversal of 891009312 is 213900198.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113614 + ... + 121202.

It is an arithmetic number, because the mean of its divisors is an integer number (48773340).

Almost surely, 2^891009312 is an apocalyptic number.

It is an amenable number.

891009312 is an abundant number, since it is smaller than the sum of its proper divisors (1450111008).

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

891009312 is a wasteful number, since it uses less digits than its factorization.

891009312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8825 (or 8817 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 891009312 is about 29849.7790946600. The cubic root of 891009312 is about 962.2636512384.

The spelling of 891009312 in words is "eight hundred ninety-one million, nine thousand, three hundred twelve".