82720343 has 4 divisors (see below), whose sum is σ = 83351928. Its totient is φ = 82088760.

The previous prime is 82720327. The next prime is 82720361. The reversal of 82720343 is 34302728.

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 82720343 - 2⁴ = 82720327 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 (82720543) 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, 315596 + ... + 315857.

It is an arithmetic number, because the mean of its divisors is an integer number (20837982).

Almost surely, 2^82720343 is an apocalyptic number.

82720343 is a deficient number, since it is larger than the sum of its proper divisors (631585).

82720343 is a wasteful number, since it uses less digits than its factorization.

82720343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631584.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 82720343 is about 9095.0724571056. The cubic root of 82720343 is about 435.7166027903.

The spelling of 82720343 in words is "eighty-two million, seven hundred twenty thousand, three hundred forty-three".