63405664 has 96 divisors (see below), whose sum is σ = 154054656. Its totient is φ = 25090560.

The previous prime is 63405653. The next prime is 63405673. The reversal of 63405664 is 46650436.

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, 159514 + ... + 159910.

It is an arithmetic number, because the mean of its divisors is an integer number (1604736).

Almost surely, 2^63405664 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 63405664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77027328).

63405664 is an abundant number, since it is smaller than the sum of its proper divisors (90648992).

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

63405664 is a wasteful number, since it uses less digits than its factorization.

63405664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 63405664 is about 7962.7673581488. The cubic root of 63405664 is about 398.7579472543.

The spelling of 63405664 in words is "sixty-three million, four hundred five thousand, six hundred sixty-four".