28537217 has 2 divisors, whose sum is σ = 28537218. Its totient is φ = 28537216.

The previous prime is 28537211. The next prime is 28537231. The reversal of 28537217 is 71273582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26460736 + 2076481 = 5144^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 28537217 - 2¹² = 28533121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28537211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14268608 + 14268609.

It is an arithmetic number, because the mean of its divisors is an integer number (14268609).

Almost surely, 2^28537217 is an apocalyptic number.

It is an amenable number.

28537217 is a deficient number, since it is larger than the sum of its proper divisors (1).

28537217 is an equidigital number, since it uses as much as digits as its factorization.

28537217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23520, while the sum is 35.

The square root of 28537217 is about 5342.0236802171. The cubic root of 28537217 is about 305.5886401543.

The spelling of 28537217 in words is "twenty-eight million, five hundred thirty-seven thousand, two hundred seventeen".