81796384 has 48 divisors (see below), whose sum is σ = 173787768. Its totient is φ = 37752832.

The previous prime is 81796373. The next prime is 81796391. The reversal of 81796384 is 48369718.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 67568400 + 14227984 = 8220^2 + 3772^2 .

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27414 + ... + 30250.

Almost surely, 2^81796384 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 81796384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86893884).

81796384 is an abundant number, since it is smaller than the sum of its proper divisors (91991384).

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

81796384 is a wasteful number, since it uses less digits than its factorization.

81796384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2917 (or 2909 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 81796384 is about 9044.1353373332. The cubic root of 81796384 is about 434.0882546139.

The spelling of 81796384 in words is "eighty-one million, seven hundred ninety-six thousand, three hundred eighty-four".