26791721 has 8 divisors (see below), whose sum is σ = 29289504. Its totient is φ = 24304320.

The previous prime is 26791703. The next prime is 26791733. The reversal of 26791721 is 12719762.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26791721 - 2¹⁰ = 26790697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26791771) 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 in 7 ways as a sum of consecutive naturals, for example, 3425 + ... + 8081.

It is an arithmetic number, because the mean of its divisors is an integer number (3661188).

Almost surely, 2^26791721 is an apocalyptic number.

It is an amenable number.

26791721 is a deficient number, since it is larger than the sum of its proper divisors (2497783).

26791721 is a wasteful number, since it uses less digits than its factorization.

26791721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5191.

The product of its digits is 10584, while the sum is 35.

The square root of 26791721 is about 5176.0719662694. The cubic root of 26791721 is about 299.2266042061.

The spelling of 26791721 in words is "twenty-six million, seven hundred ninety-one thousand, seven hundred twenty-one".