63503993 has 12 divisors (see below), whose sum is σ = 77098752. Its totient is φ = 51228480.

The previous prime is 63503987. The next prime is 63504011. The reversal of 63503993 is 39930536.

It is not a de Polignac number, because 63503993 - 2⁴ = 63503977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63503963) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 13673 + ... + 17718.

It is an arithmetic number, because the mean of its divisors is an integer number (6424896).

Almost surely, 2^63503993 is an apocalyptic number.

It is an amenable number.

63503993 is a deficient number, since it is larger than the sum of its proper divisors (13594759).

63503993 is a wasteful number, since it uses less digits than its factorization.

63503993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31432 (or 31415 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 38.

The square root of 63503993 is about 7968.9392644191. The cubic root of 63503993 is about 398.9639710099.

The spelling of 63503993 in words is "sixty-three million, five hundred three thousand, nine hundred ninety-three".