81096642 has 24 divisors (see below), whose sum is σ = 191683440. Its totient is φ = 24574680.

The previous prime is 81096641. The next prime is 81096661. The reversal of 81096642 is 24669018.

81096642 is a `hidden beast` number, since 8 + 1 + 0 + 9 + 6 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 81096597 and 81096606.

It is not an unprimeable number, because it can be changed into a prime (81096641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204592 + ... + 204987.

It is an arithmetic number, because the mean of its divisors is an integer number (7986810).

Almost surely, 2^81096642 is an apocalyptic number.

81096642 is an abundant number, since it is smaller than the sum of its proper divisors (110586798).

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

81096642 is a wasteful number, since it uses less digits than its factorization.

81096642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409598 (or 409595 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 81096642 is about 9005.3673995013. The cubic root of 81096642 is about 432.8468791009.

The spelling of 81096642 in words is "eighty-one million, ninety-six thousand, six hundred forty-two".