28685863 has 2 divisors, whose sum is σ = 28685864. Its totient is φ = 28685862.

The previous prime is 28685837. The next prime is 28685893. The reversal of 28685863 is 36858682.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28685863 - 2⁹ = 28685351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28685803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14342931 + 14342932.

It is an arithmetic number, because the mean of its divisors is an integer number (14342932).

Almost surely, 2^28685863 is an apocalyptic number.

28685863 is a deficient number, since it is larger than the sum of its proper divisors (1).

28685863 is an equidigital number, since it uses as much as digits as its factorization.

28685863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 46.

The square root of 28685863 is about 5355.9185019938. The cubic root of 28685863 is about 306.1183097275.

The spelling of 28685863 in words is "twenty-eight million, six hundred eighty-five thousand, eight hundred sixty-three".