26991843840000 has 5200 divisors, whose sum is σ = 124840024404480. Its totient is φ = 5733089280000.

The previous prime is 26991843839971. The next prime is 26991843840007. The reversal of 26991843840000 is 4834819962.

26991843840000 is a `hidden beast` number, since 26 + 9 + 9 + 184 + 38 + 400 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (5200).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (26991843840007) by changing a digit.

It is a polite number, since it can be written in 399 ways as a sum of consecutive naturals, for example, 870704639985 + ... + 870704640015.

Almost surely, 2^{26991843840000} is an apocalyptic number.

26991843840000 is a gapful number since it is divisible by the number (20) 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 26991843840000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62420012202240).

26991843840000 is an abundant number, since it is smaller than the sum of its proper divisors (97848180564480).

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

26991843840000 is a wasteful number, since it uses less digits than its factorization.

26991843840000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 26991843840000 in words is "twenty-six trillion, nine hundred ninety-one billion, eight hundred forty-three million, eight hundred forty thousand".