891213984 has 72 divisors (see below), whose sum is σ = 2683486260. Its totient is φ = 279595008.

The previous prime is 891213979. The next prime is 891213997. The reversal of 891213984 is 489312198.

It can be written as a sum of positive squares in 2 ways, for example, as 877818384 + 13395600 = 29628^2 + 3660^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86119 + ... + 95910.

Almost surely, 2^891213984 is an apocalyptic number.

It is an amenable number.

891213984 is an abundant number, since it is smaller than the sum of its proper divisors (1792272276).

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

891213984 is a wasteful number, since it uses less digits than its factorization.

891213984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182062 (or 182051 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 891213984 is about 29853.2072648819. The cubic root of 891213984 is about 962.3373254957.

The spelling of 891213984 in words is "eight hundred ninety-one million, two hundred thirteen thousand, nine hundred eighty-four".