28735709 has 2 divisors, whose sum is σ = 28735710. Its totient is φ = 28735708.

The previous prime is 28735691. The next prime is 28735747. The reversal of 28735709 is 90753782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26988025 + 1747684 = 5195^2 + 1322^2 .

It is a cyclic number.

It is not a de Polignac number, because 28735709 - 2²⁴ = 11958493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28735009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14367854 + 14367855.

It is an arithmetic number, because the mean of its divisors is an integer number (14367855).

Almost surely, 2^28735709 is an apocalyptic number.

It is an amenable number.

28735709 is a deficient number, since it is larger than the sum of its proper divisors (1).

28735709 is an equidigital number, since it uses as much as digits as its factorization.

28735709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 28735709 is about 5360.5698391123. The cubic root of 28735709 is about 306.2955159893.

The spelling of 28735709 in words is "twenty-eight million, seven hundred thirty-five thousand, seven hundred nine".