28689169 has 2 divisors, whose sum is σ = 28689170. Its totient is φ = 28689168.

The previous prime is 28689137. The next prime is 28689179. The reversal of 28689169 is 96198682.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22439169 + 6250000 = 4737^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 28689169 - 2⁵ = 28689137 is a prime.

It is a super-2 number, since 2×28689169² = 1646136835821122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28689179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14344584 + 14344585.

It is an arithmetic number, because the mean of its divisors is an integer number (14344585).

Almost surely, 2^28689169 is an apocalyptic number.

It is an amenable number.

28689169 is a deficient number, since it is larger than the sum of its proper divisors (1).

28689169 is an equidigital number, since it uses as much as digits as its factorization.

28689169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 49.

The square root of 28689169 is about 5356.2271236384. The cubic root of 28689169 is about 306.1300691582.

The spelling of 28689169 in words is "twenty-eight million, six hundred eighty-nine thousand, one hundred sixty-nine".