638681278224 has 40 divisors (see below), whose sum is σ = 1799919967392. Its totient is φ = 193539781120.

The previous prime is 638681278171. The next prime is 638681278241. The reversal of 638681278224 is 422872186836.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604811289 + ... + 604812344.

Almost surely, 2^638681278224 is an apocalyptic number.

It is an amenable number.

638681278224 is an abundant number, since it is smaller than the sum of its proper divisors (1161238689168).

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

638681278224 is a wasteful number, since it uses less digits than its factorization.

638681278224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209623655 (or 1209623649 counting only the distinct ones).

The product of its digits is 12386304, while the sum is 57.

The spelling of 638681278224 in words is "six hundred thirty-eight billion, six hundred eighty-one million, two hundred seventy-eight thousand, two hundred twenty-four".