28692289 has 2 divisors, whose sum is σ = 28692290. Its totient is φ = 28692288.

The previous prime is 28692271. The next prime is 28692317. The reversal of 28692289 is 98229682.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 10029889 = 4320^2 + 3167^2 .

It is a cyclic number.

It is not a de Polignac number, because 28692289 - 2²³ = 20303681 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28692229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14346144 + 14346145.

It is an arithmetic number, because the mean of its divisors is an integer number (14346145).

Almost surely, 2^28692289 is an apocalyptic number.

It is an amenable number.

28692289 is a deficient number, since it is larger than the sum of its proper divisors (1).

28692289 is an equidigital number, since it uses as much as digits as its factorization.

28692289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 46.

The square root of 28692289 is about 5356.5183655057. The cubic root of 28692289 is about 306.1411661590.

The spelling of 28692289 in words is "twenty-eight million, six hundred ninety-two thousand, two hundred eighty-nine".