28686427 has 16 divisors (see below), whose sum is σ = 36122112. Its totient is φ = 22129920.

The previous prime is 28686419. The next prime is 28686431. The reversal of 28686427 is 72468682.

It is a cyclic number.

It is not a de Polignac number, because 28686427 - 2³ = 28686419 is a prime.

It is a super-2 number, since 2×28686427² = 1645822188052658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28686407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6123 + ... + 9739.

It is an arithmetic number, because the mean of its divisors is an integer number (2257632).

Almost surely, 2^28686427 is an apocalyptic number.

28686427 is a deficient number, since it is larger than the sum of its proper divisors (7435685).

28686427 is a wasteful number, since it uses less digits than its factorization.

28686427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3738.

The product of its digits is 258048, while the sum is 43.

The square root of 28686427 is about 5355.9711537685. The cubic root of 28686427 is about 306.1203159375.

The spelling of 28686427 in words is "twenty-eight million, six hundred eighty-six thousand, four hundred twenty-seven".