28102229 has 2 divisors, whose sum is σ = 28102230. Its totient is φ = 28102228.

The previous prime is 28102201. The next prime is 28102253. The reversal of 28102229 is 92220182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27615025 + 487204 = 5255^2 + 698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28102229 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28102198 and 28102207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28102289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14051114 + 14051115.

It is an arithmetic number, because the mean of its divisors is an integer number (14051115).

Almost surely, 2^28102229 is an apocalyptic number.

It is an amenable number.

28102229 is a deficient number, since it is larger than the sum of its proper divisors (1).

28102229 is an equidigital number, since it uses as much as digits as its factorization.

28102229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 28102229 is about 5301.1535537089. The cubic root of 28102229 is about 304.0280048358.

The spelling of 28102229 in words is "twenty-eight million, one hundred two thousand, two hundred twenty-nine".