991783072 has 48 divisors (see below), whose sum is σ = 2233732032. Its totient is φ = 424627200.

The previous prime is 991783063. The next prime is 991783073. The reversal of 991783072 is 270387199.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (991783073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346447 + ... + 349297.

It is an arithmetic number, because the mean of its divisors is an integer number (46536084).

Almost surely, 2^991783072 is an apocalyptic number.

It is an amenable number.

991783072 is an abundant number, since it is smaller than the sum of its proper divisors (1241948960).

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

991783072 is a wasteful number, since it uses less digits than its factorization.

991783072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4421 (or 4413 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 991783072 is about 31492.5875723161. The cubic root of 991783072 is about 997.2534875755.

The spelling of 991783072 in words is "nine hundred ninety-one million, seven hundred eighty-three thousand, seventy-two".