991036032 has 64 divisors (see below), whose sum is σ = 3008510400. Its totient is φ = 283152384.

The previous prime is 991036003. The next prime is 991036043. The reversal of 991036032 is 230630199.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 991035984 and 991036002.

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, 181657 + ... + 187032.

It is an arithmetic number, because the mean of its divisors is an integer number (47007975).

Almost surely, 2^991036032 is an apocalyptic number.

It is an amenable number.

991036032 is an abundant number, since it is smaller than the sum of its proper divisors (2017474368).

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

991036032 is a wasteful number, since it uses less digits than its factorization.

991036032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368713 (or 368701 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 991036032 is about 31480.7247692934. The cubic root of 991036032 is about 997.0030378573.

The spelling of 991036032 in words is "nine hundred ninety-one million, thirty-six thousand, thirty-two".