81896058 has 48 divisors (see below), whose sum is σ = 184953600. Its totient is φ = 26157600.

The previous prime is 81896057. The next prime is 81896069. The reversal of 81896058 is 85069818.

It is not an unprimeable number, because it can be changed into a prime (81896051) 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 23 ways as a sum of consecutive naturals, for example, 78303 + ... + 79341.

It is an arithmetic number, because the mean of its divisors is an integer number (3853200).

Almost surely, 2^81896058 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81896058, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92476800).

81896058 is an abundant number, since it is smaller than the sum of its proper divisors (103057542).

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

81896058 is a wasteful number, since it uses less digits than its factorization.

81896058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227 (or 1224 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 81896058 is about 9049.6440813990. The cubic root of 81896058 is about 434.2645042549.

The spelling of 81896058 in words is "eighty-one million, eight hundred ninety-six thousand, fifty-eight".