28285861 has 2 divisors, whose sum is σ = 28285862. Its totient is φ = 28285860.

The previous prime is 28285849. The next prime is 28285867. The reversal of 28285861 is 16858282.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27888961 + 396900 = 5281^2 + 630^2 .

It is a cyclic number.

It is not a de Polignac number, because 28285861 - 2⁹ = 28285349 is a prime.

It is a super-2 number, since 2×28285861² = 1600179865022642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28285867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14142930 + 14142931.

It is an arithmetic number, because the mean of its divisors is an integer number (14142931).

Almost surely, 2^28285861 is an apocalyptic number.

It is an amenable number.

28285861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28285861 is an equidigital number, since it uses as much as digits as its factorization.

28285861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61440, while the sum is 40.

The square root of 28285861 is about 5318.4453555527. The cubic root of 28285861 is about 304.6887840454.

The spelling of 28285861 in words is "twenty-eight million, two hundred eighty-five thousand, eight hundred sixty-one".