26721679 has 2 divisors, whose sum is σ = 26721680. Its totient is φ = 26721678.

The previous prime is 26721649. The next prime is 26721691. The reversal of 26721679 is 97612762.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26721679 - 2⁵ = 26721647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26721649) 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, 13360839 + 13360840.

It is an arithmetic number, because the mean of its divisors is an integer number (13360840).

Almost surely, 2^26721679 is an apocalyptic number.

26721679 is a deficient number, since it is larger than the sum of its proper divisors (1).

26721679 is an equidigital number, since it uses as much as digits as its factorization.

26721679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 26721679 is about 5169.3015969278. The cubic root of 26721679 is about 298.9656191010.

The spelling of 26721679 in words is "twenty-six million, seven hundred twenty-one thousand, six hundred seventy-nine".