638985451000 has 192 divisors, whose sum is σ = 1658598832800. Its totient is φ = 230176128000.

The previous prime is 638985450989. The next prime is 638985451043. The reversal of 638985451000 is 154589836.

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 47 ways as a sum of consecutive naturals, for example, 6882891 + ... + 6975109.

Almost surely, 2^638985451000 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 638985451000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829299416400).

638985451000 is an abundant number, since it is smaller than the sum of its proper divisors (1019613381800).

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

638985451000 is a wasteful number, since it uses less digits than its factorization.

638985451000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92307 (or 92280 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 638985451000 in words is "six hundred thirty-eight billion, nine hundred eighty-five million, four hundred fifty-one thousand".