63840728 has 24 divisors (see below), whose sum is σ = 139245300. Its totient is φ = 27360144.

The previous prime is 63840701. The next prime is 63840757. The reversal of 63840728 is 82704836.

63840728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 63840691 and 63840700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 81038 + ... + 81821.

Almost surely, 2^63840728 is an apocalyptic number.

It is an amenable number.

63840728 is an abundant number, since it is smaller than the sum of its proper divisors (75404572).

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

63840728 is a wasteful number, since it uses less digits than its factorization.

63840728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162879 (or 162868 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 63840728 is about 7990.0392990273. The cubic root of 63840728 is about 399.6679076964.

The spelling of 63840728 in words is "sixty-three million, eight hundred forty thousand, seven hundred twenty-eight".