28361857 has 2 divisors, whose sum is σ = 28361858. Its totient is φ = 28361856.

The previous prime is 28361849. The next prime is 28361863. The reversal of 28361857 is 75816382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28132416 + 229441 = 5304^2 + 479^2 .

It is a cyclic number.

It is not a de Polignac number, because 28361857 - 2³ = 28361849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28361057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14180928 + 14180929.

It is an arithmetic number, because the mean of its divisors is an integer number (14180929).

Almost surely, 2^28361857 is an apocalyptic number.

It is an amenable number.

28361857 is a deficient number, since it is larger than the sum of its proper divisors (1).

28361857 is an equidigital number, since it uses as much as digits as its factorization.

28361857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 28361857 is about 5325.5851321709. The cubic root of 28361857 is about 304.9614105079.

The spelling of 28361857 in words is "twenty-eight million, three hundred sixty-one thousand, eight hundred fifty-seven".