28072201 has 2 divisors, whose sum is σ = 28072202. Its totient is φ = 28072200.

The previous prime is 28072189. The next prime is 28072211. The reversal of 28072201 is 10227082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26574025 + 1498176 = 5155^2 + 1224^2 .

It is a cyclic number.

It is not a de Polignac number, because 28072201 - 2⁵ = 28072169 is a prime.

It is not a weakly prime, because it can be changed into another prime (28072211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14036100 + 14036101.

It is an arithmetic number, because the mean of its divisors is an integer number (14036101).

Almost surely, 2^28072201 is an apocalyptic number.

It is an amenable number.

28072201 is a deficient number, since it is larger than the sum of its proper divisors (1).

28072201 is an equidigital number, since it uses as much as digits as its factorization.

28072201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 28072201 is about 5298.3205829772. The cubic root of 28072201 is about 303.9196788318.

Adding to 28072201 its reverse (10227082), we get a palindrome (38299283).

The spelling of 28072201 in words is "twenty-eight million, seventy-two thousand, two hundred one".