82639799 has 4 divisors (see below), whose sum is σ = 90152520. Its totient is φ = 75127080.

The previous prime is 82639787. The next prime is 82639801. The reversal of 82639799 is 99793628.

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 82639799 - 2¹⁶ = 82574263 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 82639799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82639099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3756344 + ... + 3756365.

It is an arithmetic number, because the mean of its divisors is an integer number (22538130).

Almost surely, 2^82639799 is an apocalyptic number.

82639799 is a deficient number, since it is larger than the sum of its proper divisors (7512721).

82639799 is a wasteful number, since it uses less digits than its factorization.

82639799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7512720.

The product of its digits is 1469664, while the sum is 53.

The square root of 82639799 is about 9090.6434865745. The cubic root of 82639799 is about 435.5751391821.

It can be divided in two parts, 82639 and 799, that added together give a palindrome (83438).

The spelling of 82639799 in words is "eighty-two million, six hundred thirty-nine thousand, seven hundred ninety-nine".