81096136 has 24 divisors (see below), whose sum is σ = 167137110. Its totient is φ = 36861440.

The previous prime is 81096133. The next prime is 81096143. The reversal of 81096136 is 63169018.

It can be written as a sum of positive squares in only one way, i.e., 45024100 + 36072036 = 6710^2 + 6006^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81096131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40921 + ... + 42856.

Almost surely, 2^81096136 is an apocalyptic number.

It is an amenable number.

81096136 is an abundant number, since it is smaller than the sum of its proper divisors (86040974).

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

81096136 is a wasteful number, since it uses less digits than its factorization.

81096136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83805 (or 83790 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 81096136 is about 9005.3393051012. The cubic root of 81096136 is about 432.8459788541.

The spelling of 81096136 in words is "eighty-one million, ninety-six thousand, one hundred thirty-six".