891212168 has 64 divisors (see below), whose sum is σ = 2108574720. Its totient is φ = 343022400.

The previous prime is 891212143. The next prime is 891212173. The reversal of 891212168 is 861212198.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

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, 42413 + ... + 59843.

It is an arithmetic number, because the mean of its divisors is an integer number (32946480).

Almost surely, 2^891212168 is an apocalyptic number.

891212168 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891212168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1054287360).

891212168 is an abundant number, since it is smaller than the sum of its proper divisors (1217362552).

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

891212168 is a wasteful number, since it uses less digits than its factorization.

891212168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17538 (or 17534 counting only the distinct ones).

The product of its digits is 13824, while the sum is 38.

The square root of 891212168 is about 29853.1768493740. The cubic root of 891212168 is about 962.3366718533.

The spelling of 891212168 in words is "eight hundred ninety-one million, two hundred twelve thousand, one hundred sixty-eight".