63765865 has 16 divisors (see below), whose sum is σ = 79477776. Its totient is φ = 49075200.

The previous prime is 63765857. The next prime is 63765893. The reversal of 63765865 is 56856736.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 21609 + 63744256 = 147^2 + 7984^2 .

It is not a de Polignac number, because 63765865 - 2³ = 63765857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12835 + ... + 17095.

It is an arithmetic number, because the mean of its divisors is an integer number (4967361).

Almost surely, 2^63765865 is an apocalyptic number.

It is an amenable number.

63765865 is a deficient number, since it is larger than the sum of its proper divisors (15711911).

63765865 is a wasteful number, since it uses less digits than its factorization.

63765865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4380.

The product of its digits is 907200, while the sum is 46.

The square root of 63765865 is about 7985.3531543696. The cubic root of 63765865 is about 399.5116227117.

The spelling of 63765865 in words is "sixty-three million, seven hundred sixty-five thousand, eight hundred sixty-five".