991485580 has 24 divisors (see below), whose sum is σ = 2089871280. Its totient is φ = 395117760.

The previous prime is 991485563. The next prime is 991485623. The reversal of 991485580 is 85584199.

It is a hoax number, since the sum of its digits (49) 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 7 ways as a sum of consecutive naturals, for example, 86766 + ... + 97525.

It is an arithmetic number, because the mean of its divisors is an integer number (87077970).

Almost surely, 2^991485580 is an apocalyptic number.

It is an amenable number.

991485580 is an abundant number, since it is smaller than the sum of its proper divisors (1098385700).

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

991485580 is a wasteful number, since it uses less digits than its factorization.

991485580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184569 (or 184567 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 49.

The square root of 991485580 is about 31487.8640113933. The cubic root of 991485580 is about 997.1537666415.

The spelling of 991485580 in words is "nine hundred ninety-one million, four hundred eighty-five thousand, five hundred eighty".