81796608 has 160 divisors (see below), whose sum is σ = 248629920. Its totient is φ = 26542080.

The previous prime is 81796553. The next prime is 81796609. The reversal of 81796608 is 80669718.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81796609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 843216 + ... + 843312.

It is an arithmetic number, because the mean of its divisors is an integer number (1553937).

Almost surely, 2^81796608 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 81796608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124314960).

81796608 is an abundant number, since it is smaller than the sum of its proper divisors (166833312).

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

81796608 is an equidigital number, since it uses as much as digits as its factorization.

81796608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 81796608 is about 9044.1477210404. The cubic root of 81796608 is about 434.0886508649.

The spelling of 81796608 in words is "eighty-one million, seven hundred ninety-six thousand, six hundred eight".