28208101 has 2 divisors, whose sum is σ = 28208102. Its totient is φ = 28208100.

The previous prime is 28208093. The next prime is 28208107. The reversal of 28208101 is 10180282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27552001 + 656100 = 5249^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 28208101 - 2³ = 28208093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28208107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14104050 + 14104051.

It is an arithmetic number, because the mean of its divisors is an integer number (14104051).

Almost surely, 2^28208101 is an apocalyptic number.

It is an amenable number.

28208101 is a deficient number, since it is larger than the sum of its proper divisors (1).

28208101 is an equidigital number, since it uses as much as digits as its factorization.

28208101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 28208101 is about 5311.1299174469. The cubic root of 28208101 is about 304.4093235287.

Adding to 28208101 its reverse (10180282), we get a palindrome (38388383).

The spelling of 28208101 in words is "twenty-eight million, two hundred eight thousand, one hundred one".