28872317 has 2 divisors, whose sum is σ = 28872318. Its totient is φ = 28872316.

The previous prime is 28872293. The next prime is 28872331. The reversal of 28872317 is 71327882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23609881 + 5262436 = 4859^2 + 2294^2 .

It is a cyclic number.

It is not a de Polignac number, because 28872317 - 2¹² = 28868221 is a prime.

It is a super-2 number, since 2×28872317² = 1667221377896978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28872397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14436158 + 14436159.

It is an arithmetic number, because the mean of its divisors is an integer number (14436159).

Almost surely, 2^28872317 is an apocalyptic number.

It is an amenable number.

28872317 is a deficient number, since it is larger than the sum of its proper divisors (1).

28872317 is an equidigital number, since it uses as much as digits as its factorization.

28872317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 38.

The square root of 28872317 is about 5373.2966603380. The cubic root of 28872317 is about 306.7801196218.

The spelling of 28872317 in words is "twenty-eight million, eight hundred seventy-two thousand, three hundred seventeen".