26805402764 has 72 divisors (see below), whose sum is σ = 55428377760. Its totient is φ = 11307475200.

The previous prime is 26805402763. The next prime is 26805402769. The reversal of 26805402764 is 46720450862.

It is not an unprimeable number, because it can be changed into a prime (26805402763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11256854 + ... + 11259234.

It is an arithmetic number, because the mean of its divisors is an integer number (769838580).

Almost surely, 2^26805402764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26805402764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27714188880).

26805402764 is an abundant number, since it is smaller than the sum of its proper divisors (28622974996).

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

26805402764 is a wasteful number, since it uses less digits than its factorization.

26805402764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3279 (or 3270 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 44.

The spelling of 26805402764 in words is "twenty-six billion, eight hundred five million, four hundred two thousand, seven hundred sixty-four".