3216744385 has 4 divisors (see below), whose sum is σ = 3860093268. Its totient is φ = 2573395504.

The previous prime is 3216744379. The next prime is 3216744397. The reversal of 3216744385 is 5834476123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5834476123 = 7 ⋅833496589.

It can be written as a sum of positive squares in 2 ways, for example, as 807014464 + 2409729921 = 28408^2 + 49089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3216744385 is a prime.

It is a Duffinian 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, 321674434 + ... + 321674443.

It is an arithmetic number, because the mean of its divisors is an integer number (965023317).

Almost surely, 2^3216744385 is an apocalyptic number.

It is an amenable number.

3216744385 is a deficient number, since it is larger than the sum of its proper divisors (643348883).

3216744385 is an equidigital number, since it uses as much as digits as its factorization.

3216744385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643348882.

The product of its digits is 483840, while the sum is 43.

The square root of 3216744385 is about 56716.3502439993. The cubic root of 3216744385 is about 1476.1784144082.

The spelling of 3216744385 in words is "three billion, two hundred sixteen million, seven hundred forty-four thousand, three hundred eighty-five".