81812096 has 16 divisors (see below), whose sum is σ = 162985290. Its totient is φ = 40905984.

The previous prime is 81812063. The next prime is 81812099. The reversal of 81812096 is 69021818.

It can be written as a sum of positive squares in only one way, i.e., 79852096 + 1960000 = 8936^2 + 1400^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (81812099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319451 + ... + 319706.

Almost surely, 2^81812096 is an apocalyptic number.

It is an amenable number.

81812096 is a deficient number, since it is larger than the sum of its proper divisors (81173194).

81812096 is an equidigital number, since it uses as much as digits as its factorization.

81812096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639171 (or 639159 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 81812096 is about 9045.0039248195. The cubic root of 81812096 is about 434.1160470324.

The spelling of 81812096 in words is "eighty-one million, eight hundred twelve thousand, ninety-six".