81610752 has 96 divisors (see below), whose sum is σ = 224078400. Its totient is φ = 26394624.

The previous prime is 81610733. The next prime is 81610769. The reversal of 81610752 is 25701618.

It is a tau number, because it is divible by the number of its divisors (96).

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, 227149 + ... + 227507.

It is an arithmetic number, because the mean of its divisors is an integer number (2334150).

Almost surely, 2^81610752 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 81610752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112039200).

81610752 is an abundant number, since it is smaller than the sum of its proper divisors (142467648).

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

81610752 is a wasteful number, since it uses less digits than its factorization.

81610752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 81610752 is about 9033.8669461090. The cubic root of 81610752 is about 433.7596267799.

The spelling of 81610752 in words is "eighty-one million, six hundred ten thousand, seven hundred fifty-two".