8563728997 has 4 divisors (see below), whose sum is σ = 8565670476. Its totient is φ = 8561787520.

The previous prime is 8563728977. The next prime is 8563729003. The reversal of 8563728997 is 7998273658.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7484672196 + 1079056801 = 86514^2 + 32849^2 .

It is a cyclic number.

It is not a de Polignac number, because 8563728997 - 2²⁷ = 8429511269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8563728947) by changing a digit.

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, 964108 + ... + 972949.

It is an arithmetic number, because the mean of its divisors is an integer number (2141417619).

Almost surely, 2^8563728997 is an apocalyptic number.

It is an amenable number.

8563728997 is a deficient number, since it is larger than the sum of its proper divisors (1941479).

8563728997 is a wasteful number, since it uses less digits than its factorization.

8563728997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941478.

The product of its digits is 45722880, while the sum is 64.

The square root of 8563728997 is about 92540.4181803821. The cubic root of 8563728997 is about 2045.9152449756.

The spelling of 8563728997 in words is "eight billion, five hundred sixty-three million, seven hundred twenty-eight thousand, nine hundred ninety-seven".