81743160 has 64 divisors (see below), whose sum is σ = 246758400. Its totient is φ = 21662336.

The previous prime is 81743159. The next prime is 81743171. The reversal of 81743160 is 6134718.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18001 + ... + 22079.

It is an arithmetic number, because the mean of its divisors is an integer number (3855600).

Almost surely, 2^81743160 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 81743160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123379200).

81743160 is an abundant number, since it is smaller than the sum of its proper divisors (165015240).

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

81743160 is a wasteful number, since it uses less digits than its factorization.

81743160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260 (or 4256 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 81743160 is about 9041.1923992358. The cubic root of 81743160 is about 433.9940820475.

Adding to 81743160 its reverse (6134718), we get a palindrome (87877878).

The spelling of 81743160 in words is "eighty-one million, seven hundred forty-three thousand, one hundred sixty".