26608781 has 2 divisors, whose sum is σ = 26608782. Its totient is φ = 26608780.

The previous prime is 26608739. The next prime is 26608793. The reversal of 26608781 is 18780662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24255625 + 2353156 = 4925^2 + 1534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26608781 is a prime.

It is a super-2 number, since 2×26608781² = 1416054452611922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26608481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13304390 + 13304391.

It is an arithmetic number, because the mean of its divisors is an integer number (13304391).

Almost surely, 2^26608781 is an apocalyptic number.

It is an amenable number.

26608781 is a deficient number, since it is larger than the sum of its proper divisors (1).

26608781 is an equidigital number, since it uses as much as digits as its factorization.

26608781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 26608781 is about 5158.3699944847. The cubic root of 26608781 is about 298.5439855797.

The spelling of 26608781 in words is "twenty-six million, six hundred eight thousand, seven hundred eighty-one".