28163969 has 2 divisors, whose sum is σ = 28163970. Its totient is φ = 28163968.

The previous prime is 28163963. The next prime is 28163977. The reversal of 28163969 is 96936182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27952369 + 211600 = 5287^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 28163969 - 2⁴ = 28163953 is a prime.

It is a super-2 number, since 2×28163969² = 1586418299665922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28163963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14081984 + 14081985.

It is an arithmetic number, because the mean of its divisors is an integer number (14081985).

Almost surely, 2^28163969 is an apocalyptic number.

It is an amenable number.

28163969 is a deficient number, since it is larger than the sum of its proper divisors (1).

28163969 is an equidigital number, since it uses as much as digits as its factorization.

28163969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 44.

The square root of 28163969 is about 5306.9736196819. The cubic root of 28163969 is about 304.2504896727.

The spelling of 28163969 in words is "twenty-eight million, one hundred sixty-three thousand, nine hundred sixty-nine".