26666689 has 8 divisors (see below), whose sum is σ = 31527360. Its totient is φ = 22068816.

The previous prime is 26666669. The next prime is 26666711. The reversal of 26666689 is 98666662.

It is a happy number.

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

It is not a de Polignac number, because 26666689 - 2¹¹ = 26664641 is a prime.

It is a super-2 number, since 2×26666689² = 1422224604445442, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (26666609) 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, 65479 + ... + 65884.

It is an arithmetic number, because the mean of its divisors is an integer number (3940920).

Almost surely, 2^26666689 is an apocalyptic number.

26666689 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

26666689 is a deficient number, since it is larger than the sum of its proper divisors (4860671).

26666689 is a wasteful number, since it uses less digits than its factorization.

26666689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131399.

The product of its digits is 1119744, while the sum is 49.

The square root of 26666689 is about 5163.9799573585. The cubic root of 26666689 is about 298.7603998410.

The spelling of 26666689 in words is "twenty-six million, six hundred sixty-six thousand, six hundred eighty-nine".