63664438 has 4 divisors (see below), whose sum is σ = 95496660. Its totient is φ = 31832218.

The previous prime is 63664429. The next prime is 63664451. The reversal of 63664438 is 83446636.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 63664438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15916108 + ... + 15916111.

It is an arithmetic number, because the mean of its divisors is an integer number (23874165).

Almost surely, 2^63664438 is an apocalyptic number.

63664438 is a deficient number, since it is larger than the sum of its proper divisors (31832222).

63664438 is a wasteful number, since it uses less digits than its factorization.

63664438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31832221.

The product of its digits is 248832, while the sum is 40.

The square root of 63664438 is about 7978.9998120065. Note that the first 3 decimals coincide. The cubic root of 63664438 is about 399.2996871202.

The spelling of 63664438 in words is "sixty-three million, six hundred sixty-four thousand, four hundred thirty-eight".