82643549 has 8 divisors (see below), whose sum is σ = 84823200. Its totient is φ = 80475696.

The previous prime is 82643537. The next prime is 82643557. The reversal of 82643549 is 94534628.

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 82643549 - 2²⁰ = 81594973 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 (82643569) 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, 12254 + ... + 17760.

It is an arithmetic number, because the mean of its divisors is an integer number (10602900).

Almost surely, 2^82643549 is an apocalyptic number.

It is an amenable number.

82643549 is a deficient number, since it is larger than the sum of its proper divisors (2179651).

82643549 is a wasteful number, since it uses less digits than its factorization.

82643549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5899.

The product of its digits is 207360, while the sum is 41.

The square root of 82643549 is about 9090.8497402608. The cubic root of 82643549 is about 435.5817275414.

The spelling of 82643549 in words is "eighty-two million, six hundred forty-three thousand, five hundred forty-nine".