81594208 has 48 divisors (see below), whose sum is σ = 171702720. Its totient is φ = 38054016.

The previous prime is 81594199. The next prime is 81594211. The reversal of 81594208 is 80249518.

It is a super-2 number, since 2×81594208² = 13315229558294528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39735 + ... + 41737.

It is an arithmetic number, because the mean of its divisors is an integer number (3577140).

Almost surely, 2^81594208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81594208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85851360).

81594208 is an abundant number, since it is smaller than the sum of its proper divisors (90108512).

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

81594208 is a wasteful number, since it uses less digits than its factorization.

81594208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099 (or 2091 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 81594208 is about 9032.9512342313. The cubic root of 81594208 is about 433.7303144485.

The spelling of 81594208 in words is "eighty-one million, five hundred ninety-four thousand, two hundred eight".