81282717680 has 40 divisors (see below), whose sum is σ = 193377264432. Its totient is φ = 31756967424.

The previous prime is 81282717671. The next prime is 81282717701. The reversal of 81282717680 is 8671728218.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11810909 + ... + 11817788.

Almost surely, 2^81282717680 is an apocalyptic number.

81282717680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81282717680 is an abundant number, since it is smaller than the sum of its proper divisors (112094546752).

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

81282717680 is a wasteful number, since it uses less digits than its factorization.

81282717680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23628753 (or 23628747 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 50.

The spelling of 81282717680 in words is "eighty-one billion, two hundred eighty-two million, seven hundred seventeen thousand, six hundred eighty".