26481227978280 has 256 divisors, whose sum is σ = 85025561587200. Its totient is φ = 6574608875520.

The previous prime is 26481227978273. The next prime is 26481227978281. The reversal of 26481227978280 is 8287972218462.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (26481227978281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 195133650 + ... + 195269310.

It is an arithmetic number, because the mean of its divisors is an integer number (332131099950).

Almost surely, 2^{26481227978280} is an apocalyptic number.

26481227978280 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 26481227978280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42512780793600).

26481227978280 is an abundant number, since it is smaller than the sum of its proper divisors (58544333608920).

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

26481227978280 is a wasteful number, since it uses less digits than its factorization.

26481227978280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136724 (or 136720 counting only the distinct ones).

The product of its (nonzero) digits is 86704128, while the sum is 66.

The spelling of 26481227978280 in words is "twenty-six trillion, four hundred eighty-one billion, two hundred twenty-seven million, nine hundred seventy-eight thousand, two hundred eighty".