81840282280 has 16 divisors (see below), whose sum is σ = 184140635220. Its totient is φ = 32736112896.

The previous prime is 81840282259. The next prime is 81840282319. The reversal of 81840282280 is 8228204818.

It can be written as a sum of positive squares in 2 ways, for example, as 79139817124 + 2700465156 = 281318^2 + 51966^2 .

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 3 ways as a sum of consecutive naturals, for example, 1023003489 + ... + 1023003568.

Almost surely, 2^81840282280 is an apocalyptic number.

It is an amenable number.

81840282280 is an abundant number, since it is smaller than the sum of its proper divisors (102300352940).

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

81840282280 is a wasteful number, since it uses less digits than its factorization.

81840282280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046007068 (or 2046007064 counting only the distinct ones).

The product of its (nonzero) digits is 131072, while the sum is 43.

The spelling of 81840282280 in words is "eighty-one billion, eight hundred forty million, two hundred eighty-two thousand, two hundred eighty".