26021780928 has 896 divisors, whose sum is σ = 96131481600. Its totient is φ = 6793113600.

The previous prime is 26021780909. The next prime is 26021780957. The reversal of 26021780928 is 82908712062.

26021780928 is a `hidden beast` number, since 2 + 602 + 17 + 8 + 0 + 9 + 28 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 329389593 + ... + 329389671.

It is an arithmetic number, because the mean of its divisors is an integer number (107289600).

Almost surely, 2^26021780928 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 26021780928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48065740800).

26021780928 is an abundant number, since it is smaller than the sum of its proper divisors (70109700672).

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

26021780928 is a wasteful number, since it uses less digits than its factorization.

26021780928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 26021780928 in words is "twenty-six billion, twenty-one million, seven hundred eighty thousand, nine hundred twenty-eight".