82721343 has 4 divisors (see below), whose sum is σ = 110295128. Its totient is φ = 55147560.

The previous prime is 82721339. The next prime is 82721347. The reversal of 82721343 is 34312728.

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

It is an interprime number because it is at equal distance from previous prime (82721339) and next prime (82721347).

It is not a de Polignac number, because 82721343 - 2² = 82721339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82721343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82721347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13786888 + ... + 13786893.

It is an arithmetic number, because the mean of its divisors is an integer number (27573782).

Almost surely, 2^82721343 is an apocalyptic number.

82721343 is a deficient number, since it is larger than the sum of its proper divisors (27573785).

82721343 is a wasteful number, since it uses less digits than its factorization.

82721343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27573784.

The product of its digits is 8064, while the sum is 30.

The square root of 82721343 is about 9095.1274317626. The cubic root of 82721343 is about 435.7183585650.

The spelling of 82721343 in words is "eighty-two million, seven hundred twenty-one thousand, three hundred forty-three".