28997317 has 2 divisors, whose sum is σ = 28997318. Its totient is φ = 28997316.

The previous prime is 28997299. The next prime is 28997327. The reversal of 28997317 is 71379982.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28398241 + 599076 = 5329^2 + 774^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28997317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28997327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14498658 + 14498659.

It is an arithmetic number, because the mean of its divisors is an integer number (14498659).

Almost surely, 2^28997317 is an apocalyptic number.

It is an amenable number.

28997317 is a deficient number, since it is larger than the sum of its proper divisors (1).

28997317 is an equidigital number, since it uses as much as digits as its factorization.

28997317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 28997317 is about 5384.9156910763. The cubic root of 28997317 is about 307.2222075338. Note that the first 4 decimals are identical.

The spelling of 28997317 in words is "twenty-eight million, nine hundred ninety-seven thousand, three hundred seventeen".