81033696 has 144 divisors (see below), whose sum is σ = 253444464. Its totient is φ = 25380864.

The previous prime is 81033691. The next prime is 81033709. The reversal of 81033696 is 69633018.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 81033696.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81033691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131886 + ... + 132498.

It is an arithmetic number, because the mean of its divisors is an integer number (1760031).

Almost surely, 2^81033696 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 81033696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126722232).

81033696 is an abundant number, since it is smaller than the sum of its proper divisors (172410768).

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

81033696 is a wasteful number, since it uses less digits than its factorization.

81033696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 635 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 81033696 is about 9001.8718053525. The cubic root of 81033696 is about 432.7348603566.

The spelling of 81033696 in words is "eighty-one million, thirty-three thousand, six hundred ninety-six".