26721449856 has 256 divisors, whose sum is σ = 80213452800. Its totient is φ = 8756398080.

The previous prime is 26721449831. The next prime is 26721449861. The reversal of 26721449856 is 65894412762.

26721449856 is a `hidden beast` number, since 26 + 72 + 14 + 498 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 31 ways as a sum of consecutive naturals, for example, 96467190 + ... + 96467466.

It is an arithmetic number, because the mean of its divisors is an integer number (313333800).

Almost surely, 2^26721449856 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 26721449856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40106726400).

26721449856 is an abundant number, since it is smaller than the sum of its proper divisors (53492002944).

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

26721449856 is a wasteful number, since it uses less digits than its factorization.

26721449856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674 (or 656 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 26721449856 in words is "twenty-six billion, seven hundred twenty-one million, four hundred forty-nine thousand, eight hundred fifty-six".