26782009 has 2 divisors, whose sum is σ = 26782010. Its totient is φ = 26782008.

The previous prime is 26782003. The next prime is 26782121. The reversal of 26782009 is 90028762.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16362025 + 10419984 = 4045^2 + 3228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26782009 is a prime.

It is not a weakly prime, because it can be changed into another prime (26782003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13391004 + 13391005.

It is an arithmetic number, because the mean of its divisors is an integer number (13391005).

Almost surely, 2^26782009 is an apocalyptic number.

It is an amenable number.

26782009 is a deficient number, since it is larger than the sum of its proper divisors (1).

26782009 is an equidigital number, since it uses as much as digits as its factorization.

26782009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 26782009 is about 5175.1337180792. The cubic root of 26782009 is about 299.1904432841.

The spelling of 26782009 in words is "twenty-six million, seven hundred eighty-two thousand, nine".