63507128644 has 24 divisors (see below), whose sum is σ = 112161198240. Its totient is φ = 31461273984.

The previous prime is 63507128639. The next prime is 63507128687. The reversal of 63507128644 is 44682170536.

It is a junction number, because it is equal to n+sod(n) for n = 63507128594 and 63507128603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1315567 + ... + 1362985.

It is an arithmetic number, because the mean of its divisors is an integer number (4673383260).

Almost surely, 2^63507128644 is an apocalyptic number.

It is an amenable number.

63507128644 is a deficient number, since it is larger than the sum of its proper divisors (48654069596).

63507128644 is a wasteful number, since it uses less digits than its factorization.

63507128644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50499 (or 50497 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 63507128644 in words is "sixty-three billion, five hundred seven million, one hundred twenty-eight thousand, six hundred forty-four".