26992781 has 2 divisors, whose sum is σ = 26992782. Its totient is φ = 26992780.

The previous prime is 26992769. The next prime is 26992789. The reversal of 26992781 is 18729962.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21771556 + 5221225 = 4666^2 + 2285^2 .

It is a cyclic number.

It is not a de Polignac number, because 26992781 - 2⁶ = 26992717 is a prime.

It is a super-2 number, since 2×26992781² = 1457220452227922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26992789) 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, 13496390 + 13496391.

It is an arithmetic number, because the mean of its divisors is an integer number (13496391).

Almost surely, 2^26992781 is an apocalyptic number.

It is an amenable number.

26992781 is a deficient number, since it is larger than the sum of its proper divisors (1).

26992781 is an equidigital number, since it uses as much as digits as its factorization.

26992781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 26992781 is about 5195.4577276694. The cubic root of 26992781 is about 299.9732605797.

The spelling of 26992781 in words is "twenty-six million, nine hundred ninety-two thousand, seven hundred eighty-one".