28102201 has 2 divisors, whose sum is σ = 28102202. Its totient is φ = 28102200.

The previous prime is 28102181. The next prime is 28102229. The reversal of 28102201 is 10220182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28100601 + 1600 = 5301^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 28102201 - 2⁵ = 28102169 is a prime.

It is not a weakly prime, because it can be changed into another prime (28102001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14051100 + 14051101.

It is an arithmetic number, because the mean of its divisors is an integer number (14051101).

Almost surely, 2^28102201 is an apocalyptic number.

It is an amenable number.

28102201 is a deficient number, since it is larger than the sum of its proper divisors (1).

28102201 is an equidigital number, since it uses as much as digits as its factorization.

28102201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 28102201 is about 5301.1509127736. The cubic root of 28102201 is about 304.0279038618.

Adding to 28102201 its reverse (10220182), we get a palindrome (38322383).

The spelling of 28102201 in words is "twenty-eight million, one hundred two thousand, two hundred one".