81846860 has 12 divisors (see below), whose sum is σ = 171878448. Its totient is φ = 32738736.

The previous prime is 81846859. The next prime is 81846911. The reversal of 81846860 is 6864818.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2046152 + ... + 2046191.

It is an arithmetic number, because the mean of its divisors is an integer number (14323204).

Almost surely, 2^81846860 is an apocalyptic number.

It is an amenable number.

81846860 is an abundant number, since it is smaller than the sum of its proper divisors (90031588).

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

81846860 is a wasteful number, since it uses less digits than its factorization.

81846860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4092352 (or 4092350 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 81846860 is about 9046.9254445917. The cubic root of 81846860 is about 434.1775272369.

The spelling of 81846860 in words is "eighty-one million, eight hundred forty-six thousand, eight hundred sixty".