3689920565 has 4 divisors (see below), whose sum is σ = 4427904684. Its totient is φ = 2951936448.

The previous prime is 3689920529. The next prime is 3689920621. The reversal of 3689920565 is 5650299863.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1884775396 + 1805145169 = 43414^2 + 42487^2 .

It is a cyclic number.

It is not a de Polignac number, because 3689920565 - 2¹² = 3689916469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368992052 + ... + 368992061.

It is an arithmetic number, because the mean of its divisors is an integer number (1106976171).

Almost surely, 2^3689920565 is an apocalyptic number.

It is an amenable number.

3689920565 is a deficient number, since it is larger than the sum of its proper divisors (737984119).

3689920565 is an equidigital number, since it uses as much as digits as its factorization.

3689920565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737984118.

The product of its (nonzero) digits is 3499200, while the sum is 53.

The square root of 3689920565 is about 60744.7163545933. The cubic root of 3689920565 is about 1545.2746222348.

The spelling of 3689920565 in words is "three billion, six hundred eighty-nine million, nine hundred twenty thousand, five hundred sixty-five".