26728769 has 2 divisors, whose sum is σ = 26728770. Its totient is φ = 26728768.

The previous prime is 26728733. The next prime is 26728787. The reversal of 26728769 is 96782762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19465744 + 7263025 = 4412^2 + 2695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26728769 is a prime.

It is a super-2 number, since 2×26728769² = 1428854184510722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26728729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13364384 + 13364385.

It is an arithmetic number, because the mean of its divisors is an integer number (13364385).

Almost surely, 2^26728769 is an apocalyptic number.

It is an amenable number.

26728769 is a deficient number, since it is larger than the sum of its proper divisors (1).

26728769 is an equidigital number, since it uses as much as digits as its factorization.

26728769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 26728769 is about 5169.9873307388. The cubic root of 26728769 is about 298.9920580434.

The spelling of 26728769 in words is "twenty-six million, seven hundred twenty-eight thousand, seven hundred sixty-nine".