638632880682 has 32 divisors (see below), whose sum is σ = 1369858029120. Its totient is φ = 197868378240.

The previous prime is 638632880681. The next prime is 638632880689. The reversal of 638632880682 is 286088236836.

It is not an unprimeable number, because it can be changed into a prime (638632880681) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 52843419 + ... + 52855502.

It is an arithmetic number, because the mean of its divisors is an integer number (42808063410).

Almost surely, 2^638632880682 is an apocalyptic number.

638632880682 is an abundant number, since it is smaller than the sum of its proper divisors (731225148438).

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

638632880682 is a wasteful number, since it uses less digits than its factorization.

638632880682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105698998.

The product of its (nonzero) digits is 31850496, while the sum is 60.

The spelling of 638632880682 in words is "six hundred thirty-eight billion, six hundred thirty-two million, eight hundred eighty thousand, six hundred eighty-two".