26728181 has 2 divisors, whose sum is σ = 26728182. Its totient is φ = 26728180.

The previous prime is 26728157. The next prime is 26728211. The reversal of 26728181 is 18182762.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22562500 + 4165681 = 4750^2 + 2041^2 .

It is a cyclic number.

It is not a de Polignac number, because 26728181 - 2¹⁰ = 26727157 is a prime.

It is a super-2 number, since 2×26728181² = 1428791319137522, 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 (26728081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13364090 + 13364091.

It is an arithmetic number, because the mean of its divisors is an integer number (13364091).

Almost surely, 2^26728181 is an apocalyptic number.

It is an amenable number.

26728181 is a deficient number, since it is larger than the sum of its proper divisors (1).

26728181 is an equidigital number, since it uses as much as digits as its factorization.

26728181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 35.

The square root of 26728181 is about 5169.9304637490. The cubic root of 26728181 is about 298.9898655417.

The spelling of 26728181 in words is "twenty-six million, seven hundred twenty-eight thousand, one hundred eighty-one".