81272885300 has 144 divisors (see below), whose sum is σ = 183504921600. Its totient is φ = 31221590400.

The previous prime is 81272885293. The next prime is 81272885321. The reversal of 81272885300 is 358827218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142334015 + ... + 142334585.

Almost surely, 2^81272885300 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81272885300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91752460800).

81272885300 is an abundant number, since it is smaller than the sum of its proper divisors (102232036300).

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

81272885300 is a wasteful number, since it uses less digits than its factorization.

81272885300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 81272885300 in words is "eighty-one billion, two hundred seventy-two million, eight hundred eighty-five thousand, three hundred".