81847650 has 24 divisors (see below), whose sum is σ = 202982544. Its totient is φ = 21826000.

The previous prime is 81847631. The next prime is 81847651. The reversal of 81847650 is 5674818.

It is a junction number, because it is equal to n+sod(n) for n = 81847599 and 81847608.

It is not an unprimeable number, because it can be changed into a prime (81847651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 272676 + ... + 272975.

It is an arithmetic number, because the mean of its divisors is an integer number (8457606).

Almost surely, 2^81847650 is an apocalyptic number.

81847650 is an abundant number, since it is smaller than the sum of its proper divisors (121134894).

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

81847650 is a wasteful number, since it uses less digits than its factorization.

81847650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545666 (or 545661 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 81847650 is about 9046.9691057282. The cubic root of 81847650 is about 434.1789241511.

The spelling of 81847650 in words is "eighty-one million, eight hundred forty-seven thousand, six hundred fifty".