82550639 has 4 divisors (see below), whose sum is σ = 82569960. Its totient is φ = 82531320.

The previous prime is 82550621. The next prime is 82550641. The reversal of 82550639 is 93605528.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82550639 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 (82555639) 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, 92 + ... + 12849.

It is an arithmetic number, because the mean of its divisors is an integer number (20642490).

Almost surely, 2^82550639 is an apocalyptic number.

82550639 is a deficient number, since it is larger than the sum of its proper divisors (19321).

82550639 is a wasteful number, since it uses less digits than its factorization.

82550639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19320.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 82550639 is about 9085.7382198696. The cubic root of 82550639 is about 435.4184356127.

The spelling of 82550639 in words is "eighty-two million, five hundred fifty thousand, six hundred thirty-nine".