28244197 has 2 divisors, whose sum is σ = 28244198. Its totient is φ = 28244196.

The previous prime is 28244171. The next prime is 28244201. The reversal of 28244197 is 79144282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21242881 + 7001316 = 4609^2 + 2646^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28244197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28244107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14122098 + 14122099.

It is an arithmetic number, because the mean of its divisors is an integer number (14122099).

Almost surely, 2^28244197 is an apocalyptic number.

It is an amenable number.

28244197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28244197 is an equidigital number, since it uses as much as digits as its factorization.

28244197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 28244197 is about 5314.5269780104. The cubic root of 28244197 is about 304.5391121950.

It can be divided in two parts, 28244 and 197, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 28244197 in words is "twenty-eight million, two hundred forty-four thousand, one hundred ninety-seven".