28686607 has 2 divisors, whose sum is σ = 28686608. Its totient is φ = 28686606.

The previous prime is 28686587. The next prime is 28686611. The reversal of 28686607 is 70668682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28686607 - 2¹⁵ = 28653839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28686617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14343303 + 14343304.

It is an arithmetic number, because the mean of its divisors is an integer number (14343304).

Almost surely, 2^28686607 is an apocalyptic number.

28686607 is a deficient number, since it is larger than the sum of its proper divisors (1).

28686607 is an equidigital number, since it uses as much as digits as its factorization.

28686607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 28686607 is about 5355.9879574174. The cubic root of 28686607 is about 306.1209562117.

The spelling of 28686607 in words is "twenty-eight million, six hundred eighty-six thousand, six hundred seven".