81927846 has 96 divisors (see below), whose sum is σ = 238387968. Its totient is φ = 19638720.

The previous prime is 81927841. The next prime is 81927847. The reversal of 81927846 is 64872918.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81927841) by changing a digit.

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 in 47 ways as a sum of consecutive naturals, for example, 15745 + ... + 20291.

It is an arithmetic number, because the mean of its divisors is an integer number (2483208).

Almost surely, 2^81927846 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81927846, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119193984).

81927846 is an abundant number, since it is smaller than the sum of its proper divisors (156460122).

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

81927846 is a wasteful number, since it uses less digits than its factorization.

81927846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4586 (or 4583 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 81927846 is about 9051.4002231699. The cubic root of 81927846 is about 434.3206836557.

The spelling of 81927846 in words is "eighty-one million, nine hundred twenty-seven thousand, eight hundred forty-six".