638363748 has 96 divisors (see below), whose sum is σ = 1717632000. Its totient is φ = 182494080.

The previous prime is 638363741. The next prime is 638363771. The reversal of 638363748 is 847363836.

It is a junction number, because it is equal to n+sod(n) for n = 638363697 and 638363706.

It is not an unprimeable number, because it can be changed into a prime (638363741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 900018 + ... + 900726.

It is an arithmetic number, because the mean of its divisors is an integer number (17892000).

Almost surely, 2^638363748 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 638363748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (858816000).

638363748 is an abundant number, since it is smaller than the sum of its proper divisors (1079268252).

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

638363748 is a wasteful number, since it uses less digits than its factorization.

638363748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105 (or 1103 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 48.

The square root of 638363748 is about 25265.8613152214. The cubic root of 638363748 is about 861.0388329773.

The spelling of 638363748 in words is "six hundred thirty-eight million, three hundred sixty-three thousand, seven hundred forty-eight".