63996505 has 4 divisors (see below), whose sum is σ = 76795812. Its totient is φ = 51197200.

The previous prime is 63996473. The next prime is 63996509. The reversal of 63996505 is 50569936.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 30680521 + 33315984 = 5539^2 + 5772^2 .

It is not a de Polignac number, because 63996505 - 2⁵ = 63996473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63996509) 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, 6399646 + ... + 6399655.

It is an arithmetic number, because the mean of its divisors is an integer number (19198953).

Almost surely, 2^63996505 is an apocalyptic number.

It is an amenable number.

63996505 is a deficient number, since it is larger than the sum of its proper divisors (12799307).

63996505 is a wasteful number, since it uses less digits than its factorization.

63996505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12799306.

The product of its (nonzero) digits is 218700, while the sum is 43.

The square root of 63996505 is about 7999.7815595177. The cubic root of 63996505 is about 399.9927186175.

The spelling of 63996505 in words is "sixty-three million, nine hundred ninety-six thousand, five hundred five".