891566256 has 80 divisors (see below), whose sum is σ = 2723040000. Its totient is φ = 245946624.

The previous prime is 891566251. The next prime is 891566261. The reversal of 891566256 is 652665198.

It is an interprime number because it is at equal distance from previous prime (891566251) and next prime (891566261).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (891566251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36006 + ... + 55493.

It is an arithmetic number, because the mean of its divisors is an integer number (34038000).

Almost surely, 2^891566256 is an apocalyptic number.

It is an amenable number.

891566256 is an abundant number, since it is smaller than the sum of its proper divisors (1831473744).

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

891566256 is a wasteful number, since it uses less digits than its factorization.

891566256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91546 (or 91540 counting only the distinct ones).

The product of its digits is 777600, while the sum is 48.

The square root of 891566256 is about 29859.1067515423. The cubic root of 891566256 is about 962.4641038167.

The spelling of 891566256 in words is "eight hundred ninety-one million, five hundred sixty-six thousand, two hundred fifty-six".