63481664 has 14 divisors (see below), whose sum is σ = 125971554. Its totient is φ = 31740800.

The previous prime is 63481661. The next prime is 63481669. The reversal of 63481664 is 46618436.

It can be written as a sum of positive squares in only one way, i.e., 57760000 + 5721664 = 7600^2 + 2392^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63481661) 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 as a sum of consecutive naturals, namely, 495887 + ... + 496014.

Almost surely, 2^63481664 is an apocalyptic number.

63481664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

63481664 is a deficient number, since it is larger than the sum of its proper divisors (62489890).

63481664 is an equidigital number, since it uses as much as digits as its factorization.

63481664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991913 (or 991903 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 63481664 is about 7967.5381392247. The cubic root of 63481664 is about 398.9172048649.

The spelling of 63481664 in words is "sixty-three million, four hundred eighty-one thousand, six hundred sixty-four".