81335488 has 56 divisors (see below), whose sum is σ = 179862480. Its totient is φ = 36234240.

The previous prime is 81335483. The next prime is 81335539. The reversal of 81335488 is 88453318.

It is a self number, because there is not a number n which added to its sum of digits gives 81335488.

It is not an unprimeable number, because it can be changed into a prime (81335483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22443 + ... + 25813.

It is an arithmetic number, because the mean of its divisors is an integer number (3211830).

Almost surely, 2^81335488 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 81335488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89931240).

81335488 is an abundant number, since it is smaller than the sum of its proper divisors (98526992).

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

81335488 is a wasteful number, since it uses less digits than its factorization.

81335488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3425 (or 3415 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The square root of 81335488 is about 9018.6189630120. The cubic root of 81335488 is about 433.2714031154.

The spelling of 81335488 in words is "eighty-one million, three hundred thirty-five thousand, four hundred eighty-eight".