81848064 has 72 divisors (see below), whose sum is σ = 230685840. Its totient is φ = 25673728.

The previous prime is 81848057. The next prime is 81848087. The reversal of 81848064 is 46084818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9922 + ... + 16190.

It is an arithmetic number, because the mean of its divisors is an integer number (3203970).

Almost surely, 2^81848064 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 81848064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115342920).

81848064 is an abundant number, since it is smaller than the sum of its proper divisors (148837776).

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

81848064 is a wasteful number, since it uses less digits than its factorization.

81848064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6305 (or 6291 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 39.

The square root of 81848064 is about 9046.9919862902. The cubic root of 81848064 is about 434.1796562014.

The spelling of 81848064 in words is "eighty-one million, eight hundred forty-eight thousand, sixty-four".