81008896 has 36 divisors (see below), whose sum is σ = 164149552. Its totient is φ = 39891456.

The previous prime is 81008887. The next prime is 81008897. The reversal of 81008896 is 69880018.

It is a happy number.

It is a super-2 number, since 2×81008896² = 13124882462277632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81008897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14791 + ... + 19513.

Almost surely, 2^81008896 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 81008896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82074776).

81008896 is an abundant number, since it is smaller than the sum of its proper divisors (83140656).

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

81008896 is an equidigital number, since it uses as much as digits as its factorization.

81008896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4806 (or 4792 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 81008896 is about 9000.4942086532. The cubic root of 81008896 is about 432.6907103299.

The spelling of 81008896 in words is "eighty-one million, eight thousand, eight hundred ninety-six".