26991613696 has 72 divisors (see below), whose sum is σ = 55742529024. Its totient is φ = 13030702080.

The previous prime is 26991613687. The next prime is 26991613697. The reversal of 26991613696 is 69631619962.

It is a self number, because there is not a number n which added to its sum of digits gives 26991613696.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26991613697) 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, 3702471 + ... + 3709753.

It is an arithmetic number, because the mean of its divisors is an integer number (774201792).

Almost surely, 2^26991613696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26991613696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27871264512).

26991613696 is an abundant number, since it is smaller than the sum of its proper divisors (28750915328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26991613696 is an equidigital number, since it uses as much as digits as its factorization.

26991613696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7797 (or 7783 counting only the distinct ones).

The product of its digits is 5668704, while the sum is 58.

The spelling of 26991613696 in words is "twenty-six billion, nine hundred ninety-one million, six hundred thirteen thousand, six hundred ninety-six".