81743256 has 96 divisors (see below), whose sum is σ = 262429440. Its totient is φ = 23351328.

The previous prime is 81743237. The next prime is 81743273. The reversal of 81743256 is 65234718.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81743256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10605 + ... + 16611.

It is an arithmetic number, because the mean of its divisors is an integer number (2733640).

Almost surely, 2^81743256 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 81743256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131214720).

81743256 is an abundant number, since it is smaller than the sum of its proper divisors (180686184).

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

81743256 is a wasteful number, since it uses less digits than its factorization.

81743256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6035 (or 6019 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 81743256 is about 9041.1977082685. The cubic root of 81743256 is about 433.9942519431.

The spelling of 81743256 in words is "eighty-one million, seven hundred forty-three thousand, two hundred fifty-six".