28159213 has 2 divisors, whose sum is σ = 28159214. Its totient is φ = 28159212.

The previous prime is 28159211. The next prime is 28159223. The reversal of 28159213 is 31295182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17413929 + 10745284 = 4173^2 + 3278^2 .

It is a cyclic number.

It is not a de Polignac number, because 28159213 - 2¹ = 28159211 is a prime.

Together with 28159211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28159211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14079606 + 14079607.

It is an arithmetic number, because the mean of its divisors is an integer number (14079607).

Almost surely, 2^28159213 is an apocalyptic number.

It is an amenable number.

28159213 is a deficient number, since it is larger than the sum of its proper divisors (1).

28159213 is an equidigital number, since it uses as much as digits as its factorization.

28159213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 31.

The square root of 28159213 is about 5306.5255111042. The cubic root of 28159213 is about 304.2333626266.

The spelling of 28159213 in words is "twenty-eight million, one hundred fifty-nine thousand, two hundred thirteen".