28942217 has 2 divisors, whose sum is σ = 28942218. Its totient is φ = 28942216.

The previous prime is 28942213. The next prime is 28942231. The reversal of 28942217 is 71224982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20967241 + 7974976 = 4579^2 + 2824^2 .

It is a cyclic number.

It is not a de Polignac number, because 28942217 - 2² = 28942213 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28942213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14471108 + 14471109.

It is an arithmetic number, because the mean of its divisors is an integer number (14471109).

Almost surely, 2^28942217 is an apocalyptic number.

It is an amenable number.

28942217 is a deficient number, since it is larger than the sum of its proper divisors (1).

28942217 is an equidigital number, since it uses as much as digits as its factorization.

28942217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 28942217 is about 5379.7971151336. The cubic root of 28942217 is about 307.0274920826.

The spelling of 28942217 in words is "twenty-eight million, nine hundred forty-two thousand, two hundred seventeen".