63644944 has 40 divisors (see below), whose sum is σ = 137080512. Its totient is φ = 28379520.

The previous prime is 63644939. The next prime is 63644947. The reversal of 63644944 is 44944636.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 63644897 and 63644906.

It is not an unprimeable number, because it can be changed into a prime (63644947) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5917 + ... + 12739.

Almost surely, 2^63644944 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 63644944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68540256).

63644944 is an abundant number, since it is smaller than the sum of its proper divisors (73435568).

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

63644944 is a wasteful number, since it uses less digits than its factorization.

63644944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6895 (or 6889 counting only the distinct ones).

The product of its digits is 248832, while the sum is 40.

The square root of 63644944 is about 7977.7781367997. The cubic root of 63644944 is about 399.2589278782.

The spelling of 63644944 in words is "sixty-three million, six hundred forty-four thousand, nine hundred forty-four".