63943864 has 64 divisors (see below), whose sum is σ = 130636800. Its totient is φ = 29268096.

The previous prime is 63943853. The next prime is 63943871. The reversal of 63943864 is 46834936.

It is a self number, because there is not a number n which added to its sum of digits gives 63943864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 770367 + ... + 770449.

It is an arithmetic number, because the mean of its divisors is an integer number (2041200).

Almost surely, 2^63943864 is an apocalyptic number.

It is an amenable number.

63943864 is an abundant number, since it is smaller than the sum of its proper divisors (66692936).

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

63943864 is a wasteful number, since it uses less digits than its factorization.

63943864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 240 counting only the distinct ones).

The product of its digits is 373248, while the sum is 43.

The square root of 63943864 is about 7996.4907303141. The cubic root of 63943864 is about 399.8830157901.

The spelling of 63943864 in words is "sixty-three million, nine hundred forty-three thousand, eight hundred sixty-four".