63644152720 has 40 divisors (see below), whose sum is σ = 147984709176. Its totient is φ = 25455587328.

The previous prime is 63644152711. The next prime is 63644152721. The reversal of 63644152720 is 2725144636.

It can be written as a sum of positive squares in 4 ways, for example, as 5335425936 + 58308726784 = 73044^2 + 241472^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (63644152721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1292064 + ... + 1340416.

Almost surely, 2^63644152720 is an apocalyptic number.

It is an amenable number.

63644152720 is an abundant number, since it is smaller than the sum of its proper divisors (84340556456).

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

63644152720 is a wasteful number, since it uses less digits than its factorization.

63644152720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64819 (or 64813 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 63644152720 in words is "sixty-three billion, six hundred forty-four million, one hundred fifty-two thousand, seven hundred twenty".