28660817 has 2 divisors, whose sum is σ = 28660818. Its totient is φ = 28660816.

The previous prime is 28660799. The next prime is 28660837. The reversal of 28660817 is 71806682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26584336 + 2076481 = 5156^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 28660817 - 2⁸ = 28660561 is a prime.

It is a super-2 number, since 2×28660817² = 1642884862214978, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28660837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14330408 + 14330409.

It is an arithmetic number, because the mean of its divisors is an integer number (14330409).

Almost surely, 2^28660817 is an apocalyptic number.

It is an amenable number.

28660817 is a deficient number, since it is larger than the sum of its proper divisors (1).

28660817 is an equidigital number, since it uses as much as digits as its factorization.

28660817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28660817 is about 5353.5798303565. The cubic root of 28660817 is about 306.0291918268.

The spelling of 28660817 in words is "twenty-eight million, six hundred sixty thousand, eight hundred seventeen".