63963993 has 4 divisors (see below), whose sum is σ = 85285328. Its totient is φ = 42642660.

The previous prime is 63963983. The next prime is 63963997. The reversal of 63963993 is 39936936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 63963993 - 2⁵ = 63963961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63963997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10660663 + ... + 10660668.

It is an arithmetic number, because the mean of its divisors is an integer number (21321332).

Almost surely, 2^63963993 is an apocalyptic number.

It is an amenable number.

63963993 is a deficient number, since it is larger than the sum of its proper divisors (21321335).

63963993 is a wasteful number, since it uses less digits than its factorization.

63963993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21321334.

The product of its digits is 708588, while the sum is 48.

The square root of 63963993 is about 7997.7492458816. The cubic root of 63963993 is about 399.9249713443.

The spelling of 63963993 in words is "sixty-three million, nine hundred sixty-three thousand, nine hundred ninety-three".