991982080 has 40 divisors (see below), whose sum is σ = 2378438172. Its totient is φ = 396791808.

The previous prime is 991982063. The next prime is 991982119. The reversal of 991982080 is 80289199.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 982446336 + 9535744 = 31344^2 + 3088^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×991982080² = 1968056894082252800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 991982080.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191187 + ... + 196306.

Almost surely, 2^991982080 is an apocalyptic number.

It is an amenable number.

991982080 is an abundant number, since it is smaller than the sum of its proper divisors (1386456092).

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

991982080 is an equidigital number, since it uses as much as digits as its factorization.

991982080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387516 (or 387500 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 991982080 is about 31495.7470144780. The cubic root of 991982080 is about 997.3201850065.

The spelling of 991982080 in words is "nine hundred ninety-one million, nine hundred eighty-two thousand, eighty".