81794916 has 108 divisors (see below), whose sum is σ = 243685260. Its totient is φ = 23063040.

The previous prime is 81794897. The next prime is 81794927. The reversal of 81794916 is 61949718.

It is a happy number.

81794916 is nontrivially palindromic in base 5.

It can be written as a sum of positive squares in 2 ways, for example, as 19448100 + 62346816 = 4410^2 + 7896^2 .

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 156736 + ... + 157256.

It is an arithmetic number, because the mean of its divisors is an integer number (2256345).

Almost surely, 2^81794916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81794916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121842630).

81794916 is an abundant number, since it is smaller than the sum of its proper divisors (161890344).

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

81794916 is a wasteful number, since it uses less digits than its factorization.

81794916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 622 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 81794916 is about 9044.0541794043. The cubic root of 81794916 is about 434.0856577373.

The spelling of 81794916 in words is "eighty-one million, seven hundred ninety-four thousand, nine hundred sixteen".