81284812080 has 40 divisors (see below), whose sum is σ = 251982918192. Its totient is φ = 21675949824.

The previous prime is 81284812073. The next prime is 81284812097. The reversal of 81284812080 is 8021848218.

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

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, 169343119 + ... + 169343598.

Almost surely, 2^81284812080 is an apocalyptic number.

81284812080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81284812080 is an abundant number, since it is smaller than the sum of its proper divisors (170698106112).

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

81284812080 is a wasteful number, since it uses less digits than its factorization.

81284812080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338686733 (or 338686727 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 42.

The spelling of 81284812080 in words is "eighty-one billion, two hundred eighty-four million, eight hundred twelve thousand, eighty".