28522861 has 2 divisors, whose sum is σ = 28522862. Its totient is φ = 28522860.

The previous prime is 28522853. The next prime is 28522903. The reversal of 28522861 is 16822582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 10118761 = 4290^2 + 3181^2 .

It is a cyclic number.

It is not a de Polignac number, because 28522861 - 2³ = 28522853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28522831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14261430 + 14261431.

It is an arithmetic number, because the mean of its divisors is an integer number (14261431).

Almost surely, 2^28522861 is an apocalyptic number.

It is an amenable number.

28522861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28522861 is an equidigital number, since it uses as much as digits as its factorization.

28522861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 34.

The square root of 28522861 is about 5340.6798256402. The cubic root of 28522861 is about 305.5373881773.

The spelling of 28522861 in words is "twenty-eight million, five hundred twenty-two thousand, eight hundred sixty-one".