28036709 has 2 divisors, whose sum is σ = 28036710. Its totient is φ = 28036708.

The previous prime is 28036681. The next prime is 28036711. The reversal of 28036709 is 90763082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21390625 + 6646084 = 4625^2 + 2578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28036709 is a prime.

Together with 28036711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28036109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14018354 + 14018355.

It is an arithmetic number, because the mean of its divisors is an integer number (14018355).

Almost surely, 2^28036709 is an apocalyptic number.

It is an amenable number.

28036709 is a deficient number, since it is larger than the sum of its proper divisors (1).

28036709 is an equidigital number, since it uses as much as digits as its factorization.

28036709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 28036709 is about 5294.9701604447. The cubic root of 28036709 is about 303.7915417902.

The spelling of 28036709 in words is "twenty-eight million, thirty-six thousand, seven hundred nine".