3872647865 has 16 divisors (see below), whose sum is σ = 4673168640. Its totient is φ = 3080837760.

The previous prime is 3872647829. The next prime is 3872647903. The reversal of 3872647865 is 5687462783.

It is not a de Polignac number, because 3872647865 - 2²⁰ = 3871599289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3872647865.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 766016 + ... + 771054.

It is an arithmetic number, because the mean of its divisors is an integer number (292073040).

Almost surely, 2^3872647865 is an apocalyptic number.

It is an amenable number.

3872647865 is a deficient number, since it is larger than the sum of its proper divisors (800520775).

3872647865 is a wasteful number, since it uses less digits than its factorization.

3872647865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5872.

The product of its digits is 13547520, while the sum is 56.

The square root of 3872647865 is about 62230.6023191163. The cubic root of 3872647865 is about 1570.3724575108.

The spelling of 3872647865 in words is "three billion, eight hundred seventy-two million, six hundred forty-seven thousand, eight hundred sixty-five".