82684639 has 4 divisors (see below), whose sum is σ = 83731360. Its totient is φ = 81637920.

The previous prime is 82684631. The next prime is 82684669. The reversal of 82684639 is 93648628.

It is a happy number.

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 82684639 - 2³ = 82684631 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 (82684631) 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, 523242 + ... + 523399.

It is an arithmetic number, because the mean of its divisors is an integer number (20932840).

Almost surely, 2^82684639 is an apocalyptic number.

82684639 is a deficient number, since it is larger than the sum of its proper divisors (1046721).

82684639 is a wasteful number, since it uses less digits than its factorization.

82684639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046720.

The product of its digits is 497664, while the sum is 46.

The square root of 82684639 is about 9093.1094241739. The cubic root of 82684639 is about 435.6539053377.

The spelling of 82684639 in words is "eighty-two million, six hundred eighty-four thousand, six hundred thirty-nine".