991304295472 has 80 divisors (see below), whose sum is σ = 2037785233120. Its totient is φ = 465850828800.

The previous prime is 991304295439. The next prime is 991304295493. The reversal of 991304295472 is 274592403199.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23143708 + ... + 23186500.

It is an arithmetic number, because the mean of its divisors is an integer number (25472315414).

Almost surely, 2^991304295472 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 991304295472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1018892616560).

991304295472 is an abundant number, since it is smaller than the sum of its proper divisors (1046480937648).

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

991304295472 is a wasteful number, since it uses less digits than its factorization.

991304295472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43422 (or 43416 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 991304295472 in words is "nine hundred ninety-one billion, three hundred four million, two hundred ninety-five thousand, four hundred seventy-two".