638463036 has 24 divisors (see below), whose sum is σ = 1501480960. Its totient is φ = 211144752.

The previous prime is 638463017. The next prime is 638463041. The reversal of 638463036 is 630364836.

It is a junction number, because it is equal to n+sod(n) for n = 638462985 and 638463003.

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 7 ways as a sum of consecutive naturals, for example, 207946 + ... + 210993.

Almost surely, 2^638463036 is an apocalyptic number.

It is an amenable number.

638463036 is an abundant number, since it is smaller than the sum of its proper divisors (863017924).

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

638463036 is a wasteful number, since it uses less digits than its factorization.

638463036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419073 (or 419071 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 39.

The square root of 638463036 is about 25267.8261035650. The cubic root of 638463036 is about 861.0834712639.

The spelling of 638463036 in words is "six hundred thirty-eight million, four hundred sixty-three thousand, thirty-six".