63995889 has 4 divisors (see below), whose sum is σ = 85327856. Its totient is φ = 42663924.

The previous prime is 63995881. The next prime is 63995909. The reversal of 63995889 is 98859936.

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 63995889 - 2³ = 63995881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63995881) 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 3 ways as a sum of consecutive naturals, for example, 10665979 + ... + 10665984.

It is an arithmetic number, because the mean of its divisors is an integer number (21331964).

Almost surely, 2^63995889 is an apocalyptic number.

It is an amenable number.

63995889 is a deficient number, since it is larger than the sum of its proper divisors (21331967).

63995889 is a wasteful number, since it uses less digits than its factorization.

63995889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21331966.

The product of its digits is 4199040, while the sum is 57.

The square root of 63995889 is about 7999.7430583738. The cubic root of 63995889 is about 399.9914352333.

The spelling of 63995889 in words is "sixty-three million, nine hundred ninety-five thousand, eight hundred eighty-nine".