891668232 has 384 divisors, whose sum is σ = 3184796160. Its totient is φ = 218972160.

The previous prime is 891668231. The next prime is 891668243. The reversal of 891668232 is 232866198.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (891668231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9192408 + ... + 9192504.

It is an arithmetic number, because the mean of its divisors is an integer number (8293740).

Almost surely, 2^891668232 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 891668232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1592398080).

891668232 is an abundant number, since it is smaller than the sum of its proper divisors (2293127928).

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

891668232 is a wasteful number, since it uses less digits than its factorization.

891668232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 206 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 891668232 is about 29860.8143224528. The cubic root of 891668232 is about 962.5007974806.

The spelling of 891668232 in words is "eight hundred ninety-one million, six hundred sixty-eight thousand, two hundred thirty-two".