991477032 has 192 divisors, whose sum is σ = 3136942080. Its totient is φ = 255580416.

The previous prime is 991477007. The next prime is 991477051. The reversal of 991477032 is 230774199.

991477032 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1334053 + ... + 1334795.

It is an arithmetic number, because the mean of its divisors is an integer number (16338240).

Almost surely, 2^991477032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991477032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1568471040).

991477032 is an abundant number, since it is smaller than the sum of its proper divisors (2145465048).

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

991477032 is a wasteful number, since it uses less digits than its factorization.

991477032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 991477032 is about 31487.7282762666. The cubic root of 991477032 is about 997.1509010107.

The spelling of 991477032 in words is "nine hundred ninety-one million, four hundred seventy-seven thousand, thirty-two".