6728985 has 12 divisors (see below), whose sum is σ = 11663652. Its totient is φ = 3588768.

The previous prime is 6728977. The next prime is 6729007. The reversal of 6728985 is 5898276.

It can be written as a sum of positive squares in 2 ways, for example, as 3732624 + 2996361 = 1932^2 + 1731^2 .

It is not a de Polignac number, because 6728985 - 2³ = 6728977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 149533 = 6728985 / (6 + 7 + 2 + 8 + 9 + 8 + 5).

It is a d-powerful number, because it can be written as 6⁸ + 7 + 2⁷ + 8⁴ + 9⁷ + 8⁶ + 5² .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6728985.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74722 + ... + 74811.

It is an arithmetic number, because the mean of its divisors is an integer number (971971).

Almost surely, 2^6728985 is an apocalyptic number.

It is an amenable number.

6728985 is a deficient number, since it is larger than the sum of its proper divisors (4934667).

6728985 is a wasteful number, since it uses less digits than its factorization.

6728985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149544 (or 149541 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 6728985 is about 2594.0287199644. The cubic root of 6728985 is about 188.7918258844.

The spelling of 6728985 in words is "six million, seven hundred twenty-eight thousand, nine hundred eighty-five".