638613481254 has 128 divisors (see below), whose sum is σ = 1533004185600. Its totient is φ = 173493586560.

The previous prime is 638613481237. The next prime is 638613481267. The reversal of 638613481254 is 452184316836.

It is a junction number, because it is equal to n+sod(n) for n = 638613481197 and 638613481206.

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 63 ways as a sum of consecutive naturals, for example, 88117459 + ... + 88124705.

It is an arithmetic number, because the mean of its divisors is an integer number (11976595200).

Almost surely, 2^638613481254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638613481254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (766502092800).

638613481254 is an abundant number, since it is smaller than the sum of its proper divisors (894390704346).

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

638613481254 is a wasteful number, since it uses less digits than its factorization.

638613481254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8378.

The product of its digits is 3317760, while the sum is 51.

The spelling of 638613481254 in words is "six hundred thirty-eight billion, six hundred thirteen million, four hundred eighty-one thousand, two hundred fifty-four".