26809798920 has 128 divisors (see below), whose sum is σ = 82913932800. Its totient is φ = 6929888256.

The previous prime is 26809798909. The next prime is 26809798943. The reversal of 26809798920 is 2989790862.

It is a happy number.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1183137 + ... + 1205583.

It is an arithmetic number, because the mean of its divisors is an integer number (647765100).

Almost surely, 2^26809798920 is an apocalyptic number.

26809798920 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 26809798920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41456966400).

26809798920 is an abundant number, since it is smaller than the sum of its proper divisors (56104133880).

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

26809798920 is a wasteful number, since it uses less digits than its factorization.

26809798920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22767 (or 22763 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 60.

The spelling of 26809798920 in words is "twenty-six billion, eight hundred nine million, seven hundred ninety-eight thousand, nine hundred twenty".