26640769 has 2 divisors, whose sum is σ = 26640770. Its totient is φ = 26640768.

The previous prime is 26640743. The next prime is 26640787. The reversal of 26640769 is 96704662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26471025 + 169744 = 5145^2 + 412^2 .

It is a cyclic number.

It is not a de Polignac number, because 26640769 - 2¹³ = 26632577 is a prime.

It is a super-2 number, since 2×26640769² = 1419461145822722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26640709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13320384 + 13320385.

It is an arithmetic number, because the mean of its divisors is an integer number (13320385).

Almost surely, 2^26640769 is an apocalyptic number.

It is an amenable number.

26640769 is a deficient number, since it is larger than the sum of its proper divisors (1).

26640769 is an equidigital number, since it uses as much as digits as its factorization.

26640769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 26640769 is about 5161.4696550498. The cubic root of 26640769 is about 298.6635701730.

The spelling of 26640769 in words is "twenty-six million, six hundred forty thousand, seven hundred sixty-nine".