81096140 has 12 divisors (see below), whose sum is σ = 170301936. Its totient is φ = 32438448.

The previous prime is 81096133. The next prime is 81096143. The reversal of 81096140 is 4169018.

It is not an unprimeable number, because it can be changed into a prime (81096143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2027384 + ... + 2027423.

It is an arithmetic number, because the mean of its divisors is an integer number (14191828).

Almost surely, 2^81096140 is an apocalyptic number.

It is an amenable number.

81096140 is an abundant number, since it is smaller than the sum of its proper divisors (89205796).

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

81096140 is a wasteful number, since it uses less digits than its factorization.

81096140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4054816 (or 4054814 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 81096140 is about 9005.3395271916. The cubic root of 81096140 is about 432.8459859707.

The spelling of 81096140 in words is "eighty-one million, ninety-six thousand, one hundred forty".