81856522 has 32 divisors (see below), whose sum is σ = 142326720. Its totient is φ = 34917120.

The previous prime is 81856487. The next prime is 81856559. The reversal of 81856522 is 22565818.

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, 46368 + ... + 48100.

It is an arithmetic number, because the mean of its divisors is an integer number (4447710).

Almost surely, 2^81856522 is an apocalyptic number.

81856522 is a deficient number, since it is larger than the sum of its proper divisors (60470198).

81856522 is a wasteful number, since it uses less digits than its factorization.

81856522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878.

The product of its digits is 38400, while the sum is 37.

The square root of 81856522 is about 9047.4594224014. The cubic root of 81856522 is about 434.1946114117.

The spelling of 81856522 in words is "eighty-one million, eight hundred fifty-six thousand, five hundred twenty-two".