638306980 has 48 divisors (see below), whose sum is σ = 1379863296. Its totient is φ = 247847040.

The previous prime is 638306951. The next prime is 638306987. The reversal of 638306980 is 89603836.

It is not an unprimeable number, because it can be changed into a prime (638306987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 466257 + ... + 467623.

It is an arithmetic number, because the mean of its divisors is an integer number (28747152).

Almost surely, 2^638306980 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 638306980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689931648).

638306980 is an abundant number, since it is smaller than the sum of its proper divisors (741556316).

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

638306980 is a wasteful number, since it uses less digits than its factorization.

638306980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2044 (or 2042 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 638306980 is about 25264.7378771283. The cubic root of 638306980 is about 861.0133089186.

The spelling of 638306980 in words is "six hundred thirty-eight million, three hundred six thousand, nine hundred eighty".