63664403 has 16 divisors (see below), whose sum is σ = 71076096. Its totient is φ = 56540640.

The previous prime is 63664399. The next prime is 63664409. The reversal of 63664403 is 30446636.

It is a cyclic number.

It is not a de Polignac number, because 63664403 - 2² = 63664399 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 63664403.

It is not an unprimeable number, because it can be changed into a prime (63664409) 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, 93701 + ... + 94377.

It is an arithmetic number, because the mean of its divisors is an integer number (4442256).

Almost surely, 2^63664403 is an apocalyptic number.

63664403 is a deficient number, since it is larger than the sum of its proper divisors (7411693).

63664403 is a wasteful number, since it uses less digits than its factorization.

63664403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874.

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 63664403 is about 7978.9976187489. The cubic root of 63664403 is about 399.2996139475.

It can be divided in two parts, 63 and 664403, that added together give a palindrome (664466).

The spelling of 63664403 in words is "sixty-three million, six hundred sixty-four thousand, four hundred three".