81406017089280 has 864 divisors, whose sum is σ = 316718236598400. Its totient is φ = 19154568609792.

The previous prime is 81406017089239. The next prime is 81406017089281. The reversal of 81406017089280 is 8298071060418.

81406017089280 is a `hidden beast` number, since 8 + 1 + 4 + 0 + 601 + 7 + 0 + 8 + 9 + 28 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81406017089281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5886609406 + ... + 5886623234.

It is an arithmetic number, because the mean of its divisors is an integer number (366572033100).

Almost surely, 2^{81406017089280} is an apocalyptic number.

81406017089280 is a gapful number since it is divisible by the number (80) 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 81406017089280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158359118299200).

81406017089280 is an abundant number, since it is smaller than the sum of its proper divisors (235312219509120).

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

81406017089280 is a wasteful number, since it uses less digits than its factorization.

81406017089280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15601 (or 15584 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 81406017089280 in words is "eighty-one trillion, four hundred six billion, seventeen million, eighty-nine thousand, two hundred eighty".