81743982 has 16 divisors (see below), whose sum is σ = 169125840. Its totient is φ = 26308352.

The previous prime is 81743971. The next prime is 81743983. The reversal of 81743982 is 28934718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81743983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234723 + ... + 235070.

It is an arithmetic number, because the mean of its divisors is an integer number (10570365).

Almost surely, 2^81743982 is an apocalyptic number.

81743982 is an abundant number, since it is smaller than the sum of its proper divisors (87381858).

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

81743982 is a wasteful number, since it uses less digits than its factorization.

81743982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469827.

The product of its digits is 96768, while the sum is 42.

The square root of 81743982 is about 9041.2378577272. The cubic root of 81743982 is about 433.9955367744.

The spelling of 81743982 in words is "eighty-one million, seven hundred forty-three thousand, nine hundred eighty-two".