83644809 has 8 divisors (see below), whose sum is σ = 111624672. Its totient is φ = 55714080.

The previous prime is 83644793. The next prime is 83644843. The reversal of 83644809 is 90844638.

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

It is not a de Polignac number, because 83644809 - 2⁴ = 83644793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83644889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8107 + ... + 15264.

It is an arithmetic number, because the mean of its divisors is an integer number (13953084).

Almost surely, 2^83644809 is an apocalyptic number.

It is an amenable number.

83644809 is a deficient number, since it is larger than the sum of its proper divisors (27979863).

83644809 is a wasteful number, since it uses less digits than its factorization.

83644809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24567.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 83644809 is about 9145.7536048157. The cubic root of 83644809 is about 437.3337538700. Note that the first 3 decimals are identical.

The spelling of 83644809 in words is "eighty-three million, six hundred forty-four thousand, eight hundred nine".