81658096 has 80 divisors (see below), whose sum is σ = 180613440. Its totient is φ = 35692800.

The previous prime is 81658069. The next prime is 81658097. The reversal of 81658096 is 69085618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81658097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 808446 + ... + 808546.

It is an arithmetic number, because the mean of its divisors is an integer number (2257668).

Almost surely, 2^81658096 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 81658096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90306720).

81658096 is an abundant number, since it is smaller than the sum of its proper divisors (98955344).

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

81658096 is a wasteful number, since it uses less digits than its factorization.

81658096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 81658096 is about 9036.4869280047. The cubic root of 81658096 is about 433.8434880582.

It can be divided in two parts, 8165 and 8096, that added together give a palindrome (16261).

The spelling of 81658096 in words is "eighty-one million, six hundred fifty-eight thousand, ninety-six".