638750132500 has 60 divisors (see below), whose sum is σ = 1397758824000. Its totient is φ = 255328108000.

The previous prime is 638750132479. The next prime is 638750132533. The reversal of 638750132500 is 5231057836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3662277 + ... + 3832723.

It is an arithmetic number, because the mean of its divisors is an integer number (23295980400).

Almost surely, 2^638750132500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638750132500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (698879412000).

638750132500 is an abundant number, since it is smaller than the sum of its proper divisors (759008691500).

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

638750132500 is a wasteful number, since it uses less digits than its factorization.

638750132500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171970 (or 171953 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 638750132500 in words is "six hundred thirty-eight billion, seven hundred fifty million, one hundred thirty-two thousand, five hundred".