83605709 has 8 divisors (see below), whose sum is σ = 91717920. Its totient is φ = 75578800.

The previous prime is 83605703. The next prime is 83605721. The reversal of 83605709 is 90750638.

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

It is not a de Polignac number, because 83605709 - 2¹⁶ = 83540173 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 (83605703) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 19262 + ... + 23199.

It is an arithmetic number, because the mean of its divisors is an integer number (11464740).

Almost surely, 2^83605709 is an apocalyptic number.

It is an amenable number.

83605709 is a deficient number, since it is larger than the sum of its proper divisors (8112211).

83605709 is a wasteful number, since it uses less digits than its factorization.

83605709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42651.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 83605709 is about 9143.6157508942. The cubic root of 83605709 is about 437.2655989535.

Subtracting 83605709 from its reverse (90750638), we obtain a square (7144929 = 2673²).

The spelling of 83605709 in words is "eighty-three million, six hundred five thousand, seven hundred nine".