991327798 has 8 divisors (see below), whose sum is σ = 1488247992. Its totient is φ = 495245136.

The previous prime is 991327781. The next prime is 991327801. The reversal of 991327798 is 897723199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206415 + ... + 211162.

It is an arithmetic number, because the mean of its divisors is an integer number (186030999).

Almost surely, 2^991327798 is an apocalyptic number.

991327798 is a deficient number, since it is larger than the sum of its proper divisors (496920194).

991327798 is a wasteful number, since it uses less digits than its factorization.

991327798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418766.

The product of its digits is 1714608, while the sum is 55.

The square root of 991327798 is about 31485.3584702477. The cubic root of 991327798 is about 997.1008691627.

The spelling of 991327798 in words is "nine hundred ninety-one million, three hundred twenty-seven thousand, seven hundred ninety-eight".