63951664 has 80 divisors (see below), whose sum is σ = 148403200. Its totient is φ = 26671680.

The previous prime is 63951659. The next prime is 63951673. The reversal of 63951664 is 46615936.

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, 235849 + ... + 236119.

It is an arithmetic number, because the mean of its divisors is an integer number (1855040).

Almost surely, 2^63951664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63951664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74201600).

63951664 is an abundant number, since it is smaller than the sum of its proper divisors (84451536).

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

63951664 is a wasteful number, since it uses less digits than its factorization.

63951664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343 (or 323 counting only the distinct ones).

The product of its digits is 116640, while the sum is 40.

The square root of 63951664 is about 7996.9784293819. The cubic root of 63951664 is about 399.8992746381.

The spelling of 63951664 in words is "sixty-three million, nine hundred fifty-one thousand, six hundred sixty-four".