26991964608 has 224 divisors, whose sum is σ = 86651762688. Its totient is φ = 7238860800.

The previous prime is 26991964579. The next prime is 26991964621. The reversal of 26991964608 is 80646919962.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9846118 + ... + 9848858.

Almost surely, 2^26991964608 is an apocalyptic number.

26991964608 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26991964608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43325881344).

26991964608 is an abundant number, since it is smaller than the sum of its proper divisors (59659798080).

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

26991964608 is a wasteful number, since it uses less digits than its factorization.

26991964608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211 (or 3201 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 60.

The spelling of 26991964608 in words is "twenty-six billion, nine hundred ninety-one million, nine hundred sixty-four thousand, six hundred eight".