81743808 has 112 divisors (see below), whose sum is σ = 228782880. Its totient is φ = 25718784.

The previous prime is 81743801. The next prime is 81743821. The reversal of 81743808 is 80834718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81743801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294966 + ... + 295242.

Almost surely, 2^81743808 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 81743808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114391440).

81743808 is an abundant number, since it is smaller than the sum of its proper divisors (147039072).

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

81743808 is a wasteful number, since it uses less digits than its factorization.

81743808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 81743808 is about 9041.2282351459. The cubic root of 81743808 is about 433.9952288404.

The spelling of 81743808 in words is "eighty-one million, seven hundred forty-three thousand, eight hundred eight".