82640109 has 8 divisors (see below), whose sum is σ = 112749472. Its totient is φ = 53812080.

The previous prime is 82640099. The next prime is 82640137. The reversal of 82640109 is 90104628.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 82640109 - 2²⁰ = 81591533 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 (82640209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320182 + ... + 320439.

It is an arithmetic number, because the mean of its divisors is an integer number (14093684).

Almost surely, 2^82640109 is an apocalyptic number.

It is an amenable number.

82640109 is a deficient number, since it is larger than the sum of its proper divisors (30109363).

82640109 is a wasteful number, since it uses less digits than its factorization.

82640109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640667.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 82640109 is about 9090.6605370567. The cubic root of 82640109 is about 435.5756838274.

The spelling of 82640109 in words is "eighty-two million, six hundred forty thousand, one hundred nine".