83644709 has 8 divisors (see below), whose sum is σ = 88646400. Its totient is φ = 78652096.

The previous prime is 83644699. The next prime is 83644723. The reversal of 83644709 is 90744638.

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

It is a cyclic number.

It is not a de Polignac number, because 83644709 - 2¹⁶ = 83579173 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 (83644009) 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, 29642 + ... + 32340.

It is an arithmetic number, because the mean of its divisors is an integer number (11080800).

Almost surely, 2^83644709 is an apocalyptic number.

It is an amenable number.

83644709 is a deficient number, since it is larger than the sum of its proper divisors (5001691).

83644709 is a wasteful number, since it uses less digits than its factorization.

83644709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4539.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 83644709 is about 9145.7481377961. The cubic root of 83644709 is about 437.3335795878. Note that the first 3 decimals are identical.

The spelling of 83644709 in words is "eighty-three million, six hundred forty-four thousand, seven hundred nine".