81793934 has 32 divisors (see below), whose sum is σ = 135475200. Its totient is φ = 36907200.

The previous prime is 81793931. The next prime is 81793963. The reversal of 81793934 is 43939718.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81793931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57767 + ... + 59165.

It is an arithmetic number, because the mean of its divisors is an integer number (4233600).

Almost surely, 2^81793934 is an apocalyptic number.

81793934 is a deficient number, since it is larger than the sum of its proper divisors (53681266).

81793934 is a wasteful number, since it uses less digits than its factorization.

81793934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496.

The product of its digits is 163296, while the sum is 44.

The square root of 81793934 is about 9043.9998894295. Note that the first 3 decimals coincide. The cubic root of 81793934 is about 434.0839205721.

The spelling of 81793934 in words is "eighty-one million, seven hundred ninety-three thousand, nine hundred thirty-four".