28102001 has 2 divisors, whose sum is σ = 28102002. Its totient is φ = 28102000.

The previous prime is 28101991. The next prime is 28102043. The reversal of 28102001 is 10020182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26790976 + 1311025 = 5176^2 + 1145^2 .

It is a cyclic number.

It is not a de Polignac number, because 28102001 - 2¹⁰ = 28100977 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28102051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14051000 + 14051001.

It is an arithmetic number, because the mean of its divisors is an integer number (14051001).

Almost surely, 2^28102001 is an apocalyptic number.

It is an amenable number.

28102001 is a deficient number, since it is larger than the sum of its proper divisors (1).

28102001 is an equidigital number, since it uses as much as digits as its factorization.

28102001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 28102001 is about 5301.1320489118. The cubic root of 28102001 is about 304.0271826167.

Adding to 28102001 its reverse (10020182), we get a palindrome (38122183).

The spelling of 28102001 in words is "twenty-eight million, one hundred two thousand, one".