81896584 has 32 divisors (see below), whose sum is σ = 191448000. Its totient is φ = 31907520.

The previous prime is 81896569. The next prime is 81896597. The reversal of 81896584 is 48569818.

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, 65859 + ... + 67090.

It is an arithmetic number, because the mean of its divisors is an integer number (5982750).

Almost surely, 2^81896584 is an apocalyptic number.

It is an amenable number.

81896584 is an abundant number, since it is smaller than the sum of its proper divisors (109551416).

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

81896584 is a wasteful number, since it uses less digits than its factorization.

81896584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132973 (or 132969 counting only the distinct ones).

The product of its digits is 552960, while the sum is 49.

The square root of 81896584 is about 9049.6731432688. The cubic root of 81896584 is about 434.2654339807.

The spelling of 81896584 in words is "eighty-one million, eight hundred ninety-six thousand, five hundred eighty-four".