82721543 has 4 divisors (see below), whose sum is σ = 85574040. Its totient is φ = 79869048.

The previous prime is 82721539. The next prime is 82721549. The reversal of 82721543 is 34512728.

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

It is a cyclic number.

It is not a de Polignac number, because 82721543 - 2² = 82721539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82721549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1426205 + ... + 1426262.

It is an arithmetic number, because the mean of its divisors is an integer number (21393510).

Almost surely, 2^82721543 is an apocalyptic number.

82721543 is a deficient number, since it is larger than the sum of its proper divisors (2852497).

82721543 is a wasteful number, since it uses less digits than its factorization.

82721543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852496.

The product of its digits is 13440, while the sum is 32.

The square root of 82721543 is about 9095.1384266541. The cubic root of 82721543 is about 435.7187097182.

The spelling of 82721543 in words is "eighty-two million, seven hundred twenty-one thousand, five hundred forty-three".