82641009 has 16 divisors (see below), whose sum is σ = 124084224. Its totient is φ = 48469200.

The previous prime is 82640977. The next prime is 82641019. The reversal of 82641009 is 90014628.

It is not a de Polignac number, because 82641009 - 2⁵ = 82640977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82641019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39369 + ... + 41414.

It is an arithmetic number, because the mean of its divisors is an integer number (7755264).

Almost surely, 2^82641009 is an apocalyptic number.

It is an amenable number.

82641009 is a deficient number, since it is larger than the sum of its proper divisors (41443215).

82641009 is a wasteful number, since it uses less digits than its factorization.

82641009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80828.

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

The square root of 82641009 is about 9090.7100382753. The cubic root of 82641009 is about 435.5772650479.

The spelling of 82641009 in words is "eighty-two million, six hundred forty-one thousand, nine".