82512639 has 12 divisors (see below), whose sum is σ = 130020072. Its totient is φ = 50007600.

The previous prime is 82512631. The next prime is 82512641. The reversal of 82512639 is 93621528.

82512639 is a `hidden beast` number, since 8 + 2 + 5 + 12 + 639 = 666.

It is not a de Polignac number, because 82512639 - 2³ = 82512631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82512631) 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 11 ways as a sum of consecutive naturals, for example, 416632 + ... + 416829.

It is an arithmetic number, because the mean of its divisors is an integer number (10835006).

Almost surely, 2^82512639 is an apocalyptic number.

82512639 is a deficient number, since it is larger than the sum of its proper divisors (47507433).

82512639 is a wasteful number, since it uses less digits than its factorization.

82512639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833478 (or 833475 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 82512639 is about 9083.6467896985. The cubic root of 82512639 is about 435.3516142441.

Subtracting 82512639 from its reverse (93621528), we obtain a square (11108889 = 3333²).

The spelling of 82512639 in words is "eighty-two million, five hundred twelve thousand, six hundred thirty-nine".