63815964 has 12 divisors (see below), whose sum is σ = 148903944. Its totient is φ = 21271984.

The previous prime is 63815953. The next prime is 63815971. The reversal of 63815964 is 46951836.

63815964 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×63815964² = 8144954522498592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2658987 + ... + 2659010.

It is an arithmetic number, because the mean of its divisors is an integer number (12408662).

Almost surely, 2^63815964 is an apocalyptic number.

It is an amenable number.

63815964 is an abundant number, since it is smaller than the sum of its proper divisors (85087980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63815964 is a wasteful number, since it uses less digits than its factorization.

63815964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5318004 (or 5318002 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 63815964 is about 7988.4894692301. The cubic root of 63815964 is about 399.6162235736.

The spelling of 63815964 in words is "sixty-three million, eight hundred fifteen thousand, nine hundred sixty-four".