82640286 has 12 divisors (see below), whose sum is σ = 179053992. Its totient is φ = 27546756.

The previous prime is 82640263. The next prime is 82640287. The reversal of 82640286 is 68204628.

82640286 is a `hidden beast` number, since 8 + 2 + 640 + 2 + 8 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 82640286.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82640287) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2295546 + ... + 2295581.

It is an arithmetic number, because the mean of its divisors is an integer number (14921166).

Almost surely, 2^82640286 is an apocalyptic number.

82640286 is an abundant number, since it is smaller than the sum of its proper divisors (96413706).

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

82640286 is a wasteful number, since it uses less digits than its factorization.

82640286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4591135 (or 4591132 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 82640286 is about 9090.6702723177. The cubic root of 82640286 is about 435.5759948017.

The spelling of 82640286 in words is "eighty-two million, six hundred forty thousand, two hundred eighty-six".