28055317 has 2 divisors, whose sum is σ = 28055318. Its totient is φ = 28055316.

The previous prime is 28055309. The next prime is 28055327. The reversal of 28055317 is 71355082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27973521 + 81796 = 5289^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 28055317 - 2³ = 28055309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28055327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14027658 + 14027659.

It is an arithmetic number, because the mean of its divisors is an integer number (14027659).

Almost surely, 2^28055317 is an apocalyptic number.

It is an amenable number.

28055317 is a deficient number, since it is larger than the sum of its proper divisors (1).

28055317 is an equidigital number, since it uses as much as digits as its factorization.

28055317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 28055317 is about 5296.7270082571. The cubic root of 28055317 is about 303.8587358731.

The spelling of 28055317 in words is "twenty-eight million, fifty-five thousand, three hundred seventeen".