28686007 has 12 divisors (see below), whose sum is σ = 33282480. Its totient is φ = 24219648.

The previous prime is 28686001. The next prime is 28686011. The reversal of 28686007 is 70068682.

28686007 = 4² + 5² + ... + 441².

It is not a de Polignac number, because 28686007 - 2³ = 28685999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28686001) 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 11 ways as a sum of consecutive naturals, for example, 36919 + ... + 37687.

It is an arithmetic number, because the mean of its divisors is an integer number (2773540).

Almost surely, 2^28686007 is an apocalyptic number.

28686007 is a deficient number, since it is larger than the sum of its proper divisors (4596473).

28686007 is an frugal number, since it uses more digits than its factorization.

28686007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 28686007 is about 5355.9319450493. The cubic root of 28686007 is about 306.1188219538.

The spelling of 28686007 in words is "twenty-eight million, six hundred eighty-six thousand, seven".