26798145990 has 128 divisors (see below), whose sum is σ = 80263249920. Its totient is φ = 5563056000.

The previous prime is 26798145989. The next prime is 26798146031. The reversal of 26798145990 is 9954189762.

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 2653771 + ... + 2663849.

It is an arithmetic number, because the mean of its divisors is an integer number (627056640).

Almost surely, 2^26798145990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26798145990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40131624960).

26798145990 is an abundant number, since it is smaller than the sum of its proper divisors (53465103930).

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

26798145990 is a wasteful number, since it uses less digits than its factorization.

26798145990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11258.

The product of its (nonzero) digits is 9797760, while the sum is 60.

The spelling of 26798145990 in words is "twenty-six billion, seven hundred ninety-eight million, one hundred forty-five thousand, nine hundred ninety".