3220715765 has 4 divisors (see below), whose sum is σ = 3864858924. Its totient is φ = 2576572608.

The previous prime is 3220715731. The next prime is 3220715789. The reversal of 3220715765 is 5675170223.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5675170223 = 37 ⋅153382979.

It can be written as a sum of positive squares in 2 ways, for example, as 1047104881 + 2173610884 = 32359^2 + 46622^2 .

It is a cyclic number.

It is not a de Polignac number, because 3220715765 - 2¹⁶ = 3220650229 is a prime.

It is a Duffinian number.

It is a Curzon 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, 322071572 + ... + 322071581.

It is an arithmetic number, because the mean of its divisors is an integer number (966214731).

Almost surely, 2^3220715765 is an apocalyptic number.

It is an amenable number.

3220715765 is a deficient number, since it is larger than the sum of its proper divisors (644143159).

3220715765 is an equidigital number, since it uses as much as digits as its factorization.

3220715765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644143158.

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 3220715765 is about 56751.3503363576. The cubic root of 3220715765 is about 1476.7856592694.

Adding to 3220715765 its reverse (5675170223), we get a palindrome (8895885988).

The spelling of 3220715765 in words is "three billion, two hundred twenty million, seven hundred fifteen thousand, seven hundred sixty-five".