63965643 has 16 divisors (see below), whose sum is σ = 97658880. Its totient is φ = 36481536.

The previous prime is 63965621. The next prime is 63965653. The reversal of 63965643 is 34656936.

It is not a de Polignac number, because 63965643 - 2⁶ = 63965579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63965595 and 63965604.

It is not an unprimeable number, because it can be changed into a prime (63965653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9478 + ... + 14756.

It is an arithmetic number, because the mean of its divisors is an integer number (6103680).

Almost surely, 2^63965643 is an apocalyptic number.

63965643 is a deficient number, since it is larger than the sum of its proper divisors (33693237).

63965643 is a wasteful number, since it uses less digits than its factorization.

63965643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5866.

The product of its digits is 349920, while the sum is 42.

The square root of 63965643 is about 7997.8523992382. The cubic root of 63965643 is about 399.9284101046.

The spelling of 63965643 in words is "sixty-three million, nine hundred sixty-five thousand, six hundred forty-three".