82445639 has 4 divisors (see below), whose sum is σ = 86030256. Its totient is φ = 78861024.

The previous prime is 82445633. The next prime is 82445653. The reversal of 82445639 is 93654428.

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 82445639 - 2¹² = 82441543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82445596 and 82445605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82445633) 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, 1792274 + ... + 1792319.

It is an arithmetic number, because the mean of its divisors is an integer number (21507564).

Almost surely, 2^82445639 is an apocalyptic number.

82445639 is a deficient number, since it is larger than the sum of its proper divisors (3584617).

82445639 is a wasteful number, since it uses less digits than its factorization.

82445639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584616.

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

The square root of 82445639 is about 9079.9580946170. The cubic root of 82445639 is about 435.2337476280.

The spelling of 82445639 in words is "eighty-two million, four hundred forty-five thousand, six hundred thirty-nine".