26634721 has 2 divisors, whose sum is σ = 26634722. Its totient is φ = 26634720.

The previous prime is 26634697. The next prime is 26634737. The reversal of 26634721 is 12743662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16900321 + 9734400 = 4111^2 + 3120^2 .

It is a cyclic number.

It is not a de Polignac number, because 26634721 - 2⁷ = 26634593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26634781) 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, 13317360 + 13317361.

It is an arithmetic number, because the mean of its divisors is an integer number (13317361).

Almost surely, 2^26634721 is an apocalyptic number.

It is an amenable number.

26634721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26634721 is an equidigital number, since it uses as much as digits as its factorization.

26634721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

The square root of 26634721 is about 5160.8837421511. The cubic root of 26634721 is about 298.6409675474.

The spelling of 26634721 in words is "twenty-six million, six hundred thirty-four thousand, seven hundred twenty-one".