82639386 has 64 divisors (see below), whose sum is σ = 192067200. Its totient is φ = 26304768.

The previous prime is 82639343. The next prime is 82639387. The reversal of 82639386 is 68393628.

82639386 is a `hidden beast` number, since 8 + 2 + 639 + 3 + 8 + 6 = 666.

It is a super-3 number, since 3×82639386³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82639387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176725 + ... + 177191.

It is an arithmetic number, because the mean of its divisors is an integer number (3001050).

Almost surely, 2^82639386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82639386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96033600).

82639386 is an abundant number, since it is smaller than the sum of its proper divisors (109427814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82639386 is a wasteful number, since it uses less digits than its factorization.

82639386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 614 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 82639386 is about 9090.6207708825. The cubic root of 82639386 is about 435.5744135720.

The spelling of 82639386 in words is "eighty-two million, six hundred thirty-nine thousand, three hundred eighty-six".