26539891720 has 64 divisors (see below), whose sum is σ = 61838899200. Its totient is φ = 10239102720.

The previous prime is 26539891711. The next prime is 26539891723. The reversal of 26539891720 is 2719893562.

It is not an unprimeable number, because it can be changed into a prime (26539891723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1138017 + ... + 1161103.

It is an arithmetic number, because the mean of its divisors is an integer number (966232800).

Almost surely, 2^26539891720 is an apocalyptic number.

26539891720 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 26539891720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30919449600).

26539891720 is an abundant number, since it is smaller than the sum of its proper divisors (35299007480).

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

26539891720 is a wasteful number, since it uses less digits than its factorization.

26539891720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24118 (or 24114 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 26539891720 in words is "twenty-six billion, five hundred thirty-nine million, eight hundred ninety-one thousand, seven hundred twenty".