28677709 has 2 divisors, whose sum is σ = 28677710. Its totient is φ = 28677708.

The previous prime is 28677683. The next prime is 28677713. The reversal of 28677709 is 90777682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28323684 + 354025 = 5322^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 28677709 - 2⁷ = 28677581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28677739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14338854 + 14338855.

It is an arithmetic number, because the mean of its divisors is an integer number (14338855).

Almost surely, 2^28677709 is an apocalyptic number.

It is an amenable number.

28677709 is a deficient number, since it is larger than the sum of its proper divisors (1).

28677709 is an equidigital number, since it uses as much as digits as its factorization.

28677709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 28677709 is about 5355.1572339195. The cubic root of 28677709 is about 306.0893021144.

The spelling of 28677709 in words is "twenty-eight million, six hundred seventy-seven thousand, seven hundred nine".