26981982720 has 960 divisors, whose sum is σ = 118764112896. Its totient is φ = 5498634240.

The previous prime is 26981982659. The next prime is 26981982767. The reversal of 26981982720 is 2728918962.

It is a tau number, because it is divible by the number of its divisors (960).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 118863247 + ... + 118863473.

Almost surely, 2^26981982720 is an apocalyptic number.

26981982720 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 26981982720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59382056448).

26981982720 is an abundant number, since it is smaller than the sum of its proper divisors (91782130176).

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

26981982720 is a wasteful number, since it uses less digits than its factorization.

26981982720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 26981982720 in words is "twenty-six billion, nine hundred eighty-one million, nine hundred eighty-two thousand, seven hundred twenty".