63644064 has 72 divisors (see below), whose sum is σ = 183667680. Its totient is φ = 19282560.

The previous prime is 63644057. The next prime is 63644071. The reversal of 63644064 is 46044636.

It is an interprime number because it is at equal distance from previous prime (63644057) and next prime (63644071).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8877 + ... + 14355.

It is an arithmetic number, because the mean of its divisors is an integer number (2550940).

Almost surely, 2^63644064 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 63644064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91833840).

63644064 is an abundant number, since it is smaller than the sum of its proper divisors (120023616).

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

63644064 is a wasteful number, since it uses less digits than its factorization.

63644064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5514 (or 5495 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 33.

The square root of 63644064 is about 7977.7229834082. The cubic root of 63644064 is about 399.2570877243.

The spelling of 63644064 in words is "sixty-three million, six hundred forty-four thousand, sixty-four".