6885728249 has 4 divisors (see below), whose sum is σ = 6898945140. Its totient is φ = 6872511360.

The previous prime is 6885728191. The next prime is 6885728273. The reversal of 6885728249 is 9428275886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9428275886 = 2 ⋅4714137943.

It can be written as a sum of positive squares in 2 ways, for example, as 2899068649 + 3986659600 = 53843^2 + 63140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6885728249 is a prime.

It is a super-3 number, since 3×6885728249³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6885728299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6607664 + ... + 6608705.

It is an arithmetic number, because the mean of its divisors is an integer number (1724736285).

Almost surely, 2^6885728249 is an apocalyptic number.

It is an amenable number.

6885728249 is a deficient number, since it is larger than the sum of its proper divisors (13216891).

6885728249 is a wasteful number, since it uses less digits than its factorization.

6885728249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13216890.

The product of its digits is 15482880, while the sum is 59.

The square root of 6885728249 is about 82980.2883159609. The cubic root of 6885728249 is about 1902.4647835297.

The spelling of 6885728249 in words is "six billion, eight hundred eighty-five million, seven hundred twenty-eight thousand, two hundred forty-nine".