82640188 has 6 divisors (see below), whose sum is σ = 144620336. Its totient is φ = 41320092.

The previous prime is 82640167. The next prime is 82640191. The reversal of 82640188 is 88104628.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10330020 + ... + 10330027.

Almost surely, 2^82640188 is an apocalyptic number.

It is an amenable number.

82640188 is a deficient number, since it is larger than the sum of its proper divisors (61980148).

82640188 is a wasteful number, since it uses less digits than its factorization.

82640188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20660051 (or 20660049 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 82640188 is about 9090.6648821745. The cubic root of 82640188 is about 435.5758226239.

It can be divided in two parts, 82640 and 188, that added together give a palindrome (82828).

The spelling of 82640188 in words is "eighty-two million, six hundred forty thousand, one hundred eighty-eight".