26991069 has 8 divisors (see below), whose sum is σ = 41129280. Its totient is φ = 15423456.

The previous prime is 26991059. The next prime is 26991091. The reversal of 26991069 is 96019962.

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 26991069 - 2⁸ = 26990813 is a prime.

It is a super-2 number, since 2×26991069² = 1457035611525522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26991069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26991059) 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 in 7 ways as a sum of consecutive naturals, for example, 642624 + ... + 642665.

It is an arithmetic number, because the mean of its divisors is an integer number (5141160).

Almost surely, 2^26991069 is an apocalyptic number.

It is an amenable number.

26991069 is a deficient number, since it is larger than the sum of its proper divisors (14138211).

26991069 is a wasteful number, since it uses less digits than its factorization.

26991069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285299.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 26991069 is about 5195.2929657527. The cubic root of 26991069 is about 299.9669185744.

The spelling of 26991069 in words is "twenty-six million, nine hundred ninety-one thousand, sixty-nine".