997728680809 has 8 divisors (see below), whose sum is σ = 1141796027520. Its totient is φ = 854045003616.

The previous prime is 997728680791. The next prime is 997728680843. The reversal of 997728680809 is 908086827799.

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

It is not a de Polignac number, because 997728680809 - 2¹¹ = 997728678761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997728680609) 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, 95911804 + ... + 95922205.

It is an arithmetic number, because the mean of its divisors is an integer number (142724503440).

Almost surely, 2^997728680809 is an apocalyptic number.

It is an amenable number.

997728680809 is a deficient number, since it is larger than the sum of its proper divisors (144067346711).

997728680809 is a wasteful number, since it uses less digits than its factorization.

997728680809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191834759.

The product of its (nonzero) digits is 219469824, while the sum is 73.

The spelling of 997728680809 in words is "nine hundred ninety-seven billion, seven hundred twenty-eight million, six hundred eighty thousand, eight hundred nine".