81847148 has 6 divisors (see below), whose sum is σ = 143232516. Its totient is φ = 40923572.

The previous prime is 81847109. The next prime is 81847169. The reversal of 81847148 is 84174818.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10230890 + ... + 10230897.

It is an arithmetic number, because the mean of its divisors is an integer number (23872086).

Almost surely, 2^81847148 is an apocalyptic number.

It is an amenable number.

81847148 is a deficient number, since it is larger than the sum of its proper divisors (61385368).

81847148 is a wasteful number, since it uses less digits than its factorization.

81847148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20461791 (or 20461789 counting only the distinct ones).

The product of its digits is 57344, while the sum is 41.

The square root of 81847148 is about 9046.9413615874. The cubic root of 81847148 is about 434.1780364927.

The spelling of 81847148 in words is "eighty-one million, eight hundred forty-seven thousand, one hundred forty-eight".