82721443 has 8 divisors (see below), whose sum is σ = 94672640. Its totient is φ = 70803720.

The previous prime is 82721437. The next prime is 82721491. The reversal of 82721443 is 34412728.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82721443 - 2⁵ = 82721411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82721413) 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, 2823 + ... + 13168.

It is an arithmetic number, because the mean of its divisors is an integer number (11834080).

Almost surely, 2^82721443 is an apocalyptic number.

82721443 is a deficient number, since it is larger than the sum of its proper divisors (11951197).

82721443 is a wasteful number, since it uses less digits than its factorization.

82721443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16737.

The product of its digits is 10752, while the sum is 31.

The square root of 82721443 is about 9095.1329292100. The cubic root of 82721443 is about 435.7185341417.

The spelling of 82721443 in words is "eighty-two million, seven hundred twenty-one thousand, four hundred forty-three".