81847684500 has 48 divisors (see below), whose sum is σ = 238340461632. Its totient is φ = 21826048800.

The previous prime is 81847684483. The next prime is 81847684547. The reversal of 81847684500 is 548674818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27281062 + ... + 27284061.

It is an arithmetic number, because the mean of its divisors is an integer number (4965426284).

Almost surely, 2^81847684500 is an apocalyptic number.

It is an amenable number.

81847684500 is an abundant number, since it is smaller than the sum of its proper divisors (156492777132).

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

81847684500 is a wasteful number, since it uses less digits than its factorization.

81847684500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54565145 (or 54565133 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 81847684500 in words is "eighty-one billion, eight hundred forty-seven million, six hundred eighty-four thousand, five hundred".