28488217 has 2 divisors, whose sum is σ = 28488218. Its totient is φ = 28488216.

The previous prime is 28488197. The next prime is 28488227. The reversal of 28488217 is 71288482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25190361 + 3297856 = 5019^2 + 1816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28488217 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28488217.

It is not a weakly prime, because it can be changed into another prime (28488227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14244108 + 14244109.

It is an arithmetic number, because the mean of its divisors is an integer number (14244109).

Almost surely, 2^28488217 is an apocalyptic number.

It is an amenable number.

28488217 is a deficient number, since it is larger than the sum of its proper divisors (1).

28488217 is an equidigital number, since it uses as much as digits as its factorization.

28488217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57344, while the sum is 40.

The square root of 28488217 is about 5337.4354328647. The cubic root of 28488217 is about 305.4136356814.

The spelling of 28488217 in words is "twenty-eight million, four hundred eighty-eight thousand, two hundred seventeen".