82011639 has 4 divisors (see below), whose sum is σ = 109348856. Its totient is φ = 54674424.

The previous prime is 82011637. The next prime is 82011641. The reversal of 82011639 is 93611028.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (82011637) and next prime (82011641).

It is not a de Polignac number, because 82011639 - 2¹ = 82011637 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 (82011637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13668604 + ... + 13668609.

It is an arithmetic number, because the mean of its divisors is an integer number (27337214).

Almost surely, 2^82011639 is an apocalyptic number.

82011639 is a deficient number, since it is larger than the sum of its proper divisors (27337217).

82011639 is a wasteful number, since it uses less digits than its factorization.

82011639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27337216.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 82011639 is about 9056.0277716005. The cubic root of 82011639 is about 434.4687026532.

The spelling of 82011639 in words is "eighty-two million, eleven thousand, six hundred thirty-nine".