638750880380 has 96 divisors (see below), whose sum is σ = 1374363070080. Its totient is φ = 249299804160.

The previous prime is 638750880371. The next prime is 638750880437. The reversal of 638750880380 is 83088057836.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 115692020 + ... + 115697540.

It is an arithmetic number, because the mean of its divisors is an integer number (14316281980).

Almost surely, 2^638750880380 is an apocalyptic number.

It is an amenable number.

638750880380 is an abundant number, since it is smaller than the sum of its proper divisors (735612189700).

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

638750880380 is a wasteful number, since it uses less digits than its factorization.

638750880380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6439 (or 6437 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 56.

The spelling of 638750880380 in words is "six hundred thirty-eight billion, seven hundred fifty million, eight hundred eighty thousand, three hundred eighty".