6728987 has 4 divisors (see below), whose sum is σ = 6798456. Its totient is φ = 6659520.

The previous prime is 6728977. The next prime is 6729007. The reversal of 6728987 is 7898276.

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

It is a cyclic number.

It is not a de Polignac number, because 6728987 - 2⁸ = 6728731 is a prime.

It is a d-powerful number, because it can be written as 6⁸ + 7² + 2¹⁸ + 8² + 9⁷ + 8⁴ + 7² .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6728947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34589 + ... + 34782.

It is an arithmetic number, because the mean of its divisors is an integer number (1699614).

Almost surely, 2^6728987 is an apocalyptic number.

6728987 is a deficient number, since it is larger than the sum of its proper divisors (69469).

6728987 is an equidigital number, since it uses as much as digits as its factorization.

6728987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69468.

The product of its digits is 338688, while the sum is 47.

The square root of 6728987 is about 2594.0291054651. The cubic root of 6728987 is about 188.7918445887.

It can be divided in two parts, 67289 and 87, that added together give a palindrome (67376).

The spelling of 6728987 in words is "six million, seven hundred twenty-eight thousand, nine hundred eighty-seven".