28909297 has 2 divisors, whose sum is σ = 28909298. Its totient is φ = 28909296.

The previous prime is 28909273. The next prime is 28909301. The reversal of 28909297 is 79290982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28901376 + 7921 = 5376^2 + 89^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28909297 is a prime.

It is not a weakly prime, because it can be changed into another prime (28909207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14454648 + 14454649.

It is an arithmetic number, because the mean of its divisors is an integer number (14454649).

Almost surely, 2^28909297 is an apocalyptic number.

It is an amenable number.

28909297 is a deficient number, since it is larger than the sum of its proper divisors (1).

28909297 is an equidigital number, since it uses as much as digits as its factorization.

28909297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 28909297 is about 5376.7366496789. The cubic root of 28909297 is about 306.9110395935.

The spelling of 28909297 in words is "twenty-eight million, nine hundred nine thousand, two hundred ninety-seven".