72543 has 4 divisors (see below), whose sum is σ = 96728. Its totient is φ = 48360.

The previous prime is 72533. The next prime is 72547. The reversal of 72543 is 34527.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 72543 - 2⁸ = 72287 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 72543.

It is not an unprimeable number, because it can be changed into a prime (72547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12088 + ... + 12093.

It is an arithmetic number, because the mean of its divisors is an integer number (24182).

2⁷²⁵⁴³ is an apocalyptic number.

72543 is a deficient number, since it is larger than the sum of its proper divisors (24185).

72543 is a wasteful number, since it uses less digits than its factorization.

72543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24184.

The product of its digits is 840, while the sum is 21.

The square root of 72543 is about 269.3380775160. The cubic root of 72543 is about 41.7059966418.

The spelling of 72543 in words is "seventy-two thousand, five hundred forty-three".