63641728 has 32 divisors (see below), whose sum is σ = 127195020. Its totient is φ = 31718400.

The previous prime is 63641663. The next prime is 63641731. The reversal of 63641728 is 82714636.

It can be written as a sum of positive squares in 2 ways, for example, as 62853184 + 788544 = 7928^2 + 888^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53298 + ... + 54478.

Almost surely, 2^63641728 is an apocalyptic number.

It is an amenable number.

63641728 is a deficient number, since it is larger than the sum of its proper divisors (63553292).

63641728 is a wasteful number, since it uses less digits than its factorization.

63641728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616 (or 1604 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 63641728 is about 7977.5765743739. The cubic root of 63641728 is about 399.2522028698.

The spelling of 63641728 in words is "sixty-three million, six hundred forty-one thousand, seven hundred twenty-eight".