891021048 has 64 divisors (see below), whose sum is σ = 2259048960. Its totient is φ = 292832256.

The previous prime is 891021031. The next prime is 891021059. The reversal of 891021048 is 840120198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 807265 + ... + 808367.

It is an arithmetic number, because the mean of its divisors is an integer number (35297640).

Almost surely, 2^891021048 is an apocalyptic number.

It is an amenable number.

891021048 is an abundant number, since it is smaller than the sum of its proper divisors (1368027912).

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

891021048 is a wasteful number, since it uses less digits than its factorization.

891021048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556 (or 1552 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 891021048 is about 29849.9756783821. The cubic root of 891021048 is about 962.2678760640.

The spelling of 891021048 in words is "eight hundred ninety-one million, twenty-one thousand, forty-eight".