26690881 has 4 divisors (see below), whose sum is σ = 30503872. Its totient is φ = 22877892.

The previous prime is 26690863. The next prime is 26690897. The reversal of 26690881 is 18809662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26690881 - 2⁷ = 26690753 is a prime.

It is a super-2 number, since 2×26690881² = 1424806257112322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26690381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1906485 + ... + 1906498.

It is an arithmetic number, because the mean of its divisors is an integer number (7625968).

Almost surely, 2^26690881 is an apocalyptic number.

It is an amenable number.

26690881 is a deficient number, since it is larger than the sum of its proper divisors (3812991).

26690881 is an equidigital number, since it uses as much as digits as its factorization.

26690881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812990.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 26690881 is about 5166.3218056950. The cubic root of 26690881 is about 298.8507176037.

The spelling of 26690881 in words is "twenty-six million, six hundred ninety thousand, eight hundred eighty-one".