6897800809 has 15 divisors (see below), whose sum is σ = 7257560727. Its totient is φ = 6555871608.

The previous prime is 6897800803. The next prime is 6897800827. The reversal of 6897800809 is 9080087986.

The square root of 6897800809 is 83053.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2021851225 + 4875949584 = 44965^2 + 69828^2 .

It is not a de Polignac number, because 6897800809 - 2³ = 6897800801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6897800809.

It is not an unprimeable number, because it can be changed into a prime (6897800801) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 43934959 + ... + 43935115.

Almost surely, 2^6897800809 is an apocalyptic number.

6897800809 is the 83053-rd square number.

6897800809 is the 41527-th centered octagonal number.

It is an amenable number.

6897800809 is a deficient number, since it is larger than the sum of its proper divisors (359759918).

6897800809 is an frugal number, since it uses more digits than its factorization.

6897800809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 55.

The cubic root of 6897800809 is about 1903.5759809534.

The spelling of 6897800809 in words is "six billion, eight hundred ninety-seven million, eight hundred thousand, eight hundred nine".