81743606 has 16 divisors (see below), whose sum is σ = 140862624. Its totient is φ = 34850304.

The previous prime is 81743579. The next prime is 81743609. The reversal of 81743606 is 60634718.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81743609) 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, 12425 + ... + 17828.

It is an arithmetic number, because the mean of its divisors is an integer number (8803914).

Almost surely, 2^81743606 is an apocalyptic number.

81743606 is a deficient number, since it is larger than the sum of its proper divisors (59119018).

81743606 is a wasteful number, since it uses less digits than its factorization.

81743606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30455.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 81743606 is about 9041.2170640904. The cubic root of 81743606 is about 433.9948713531.

The spelling of 81743606 in words is "eighty-one million, seven hundred forty-three thousand, six hundred six".