63644648 has 8 divisors (see below), whose sum is σ = 119333730. Its totient is φ = 31822320.

The previous prime is 63644641. The next prime is 63644663. The reversal of 63644648 is 84644636.

It can be written as a sum of positive squares in only one way, i.e., 47306884 + 16337764 = 6878^2 + 4042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (63644641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3977783 + ... + 3977798.

Almost surely, 2^63644648 is an apocalyptic number.

It is an amenable number.

63644648 is a deficient number, since it is larger than the sum of its proper divisors (55689082).

63644648 is a wasteful number, since it uses less digits than its factorization.

63644648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7955587 (or 7955583 counting only the distinct ones).

The product of its digits is 331776, while the sum is 41.

The square root of 63644648 is about 7977.7595852470. The cubic root of 63644648 is about 399.2583089192.

The spelling of 63644648 in words is "sixty-three million, six hundred forty-four thousand, six hundred forty-eight".