991827264 has 56 divisors (see below), whose sum is σ = 2663411488. Its totient is φ = 325670400.

The previous prime is 991827251. The next prime is 991827337. The reversal of 991827264 is 462728199.

It is a super-2 number, since 2×991827264² = 1967442643227451392, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 25687 + ... + 51414.

Almost surely, 2^991827264 is an apocalyptic number.

It is an amenable number.

991827264 is an abundant number, since it is smaller than the sum of its proper divisors (1671584224).

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

991827264 is a wasteful number, since it uses less digits than its factorization.

991827264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77183 (or 77173 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 991827264 is about 31493.2891899211. The cubic root of 991827264 is about 997.2682992726.

The spelling of 991827264 in words is "nine hundred ninety-one million, eight hundred twenty-seven thousand, two hundred sixty-four".