26991913 has 8 divisors (see below), whose sum is σ = 30598400. Its totient is φ = 23604048.

The previous prime is 26991901. The next prime is 26991919. The reversal of 26991913 is 31919962.

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

It is not a de Polignac number, because 26991913 - 2¹³ = 26983721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26991919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54393 + ... + 54886.

It is an arithmetic number, because the mean of its divisors is an integer number (3824800).

Almost surely, 2^26991913 is an apocalyptic number.

It is an amenable number.

26991913 is a deficient number, since it is larger than the sum of its proper divisors (3606487).

26991913 is a wasteful number, since it uses less digits than its factorization.

26991913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109311.

The product of its digits is 26244, while the sum is 40.

The square root of 26991913 is about 5195.3741924909. The cubic root of 26991913 is about 299.9700451573.

The spelling of 26991913 in words is "twenty-six million, nine hundred ninety-one thousand, nine hundred thirteen".