3881297765 has 4 divisors (see below), whose sum is σ = 4657557324. Its totient is φ = 3105038208.

The previous prime is 3881297747. The next prime is 3881297851. The reversal of 3881297765 is 5677921883.

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 2834710564 + 1046587201 = 53242^2 + 32351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3881297765 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3881297765.

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, 388129772 + ... + 388129781.

It is an arithmetic number, because the mean of its divisors is an integer number (1164389331).

Almost surely, 2^3881297765 is an apocalyptic number.

It is an amenable number.

3881297765 is a deficient number, since it is larger than the sum of its proper divisors (776259559).

3881297765 is an equidigital number, since it uses as much as digits as its factorization.

3881297765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776259558.

The product of its digits is 5080320, while the sum is 56.

The square root of 3881297765 is about 62300.0623193910. The cubic root of 3881297765 is about 1571.5407764803.

The spelling of 3881297765 in words is "three billion, eight hundred eighty-one million, two hundred ninety-seven thousand, seven hundred sixty-five".