28158617 has 2 divisors, whose sum is σ = 28158618. Its totient is φ = 28158616.

The previous prime is 28158587. The next prime is 28158649. The reversal of 28158617 is 71685182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15335056 + 12823561 = 3916^2 + 3581^2 .

It is a cyclic number.

It is not a de Polignac number, because 28158617 - 2⁶ = 28158553 is a prime.

It is a super-3 number, since 3×28158617³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28158017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14079308 + 14079309.

It is an arithmetic number, because the mean of its divisors is an integer number (14079309).

Almost surely, 2^28158617 is an apocalyptic number.

It is an amenable number.

28158617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28158617 is an equidigital number, since it uses as much as digits as its factorization.

28158617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 38.

The square root of 28158617 is about 5306.4693535344. The cubic root of 28158617 is about 304.2312162081.

The spelling of 28158617 in words is "twenty-eight million, one hundred fifty-eight thousand, six hundred seventeen".