638227968 has 80 divisors (see below), whose sum is σ = 1943208960. Its totient is φ = 182347776.

The previous prime is 638227963. The next prime is 638227981. The reversal of 638227968 is 869722836.

It is a self number, because there is not a number n which added to its sum of digits gives 638227968.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638227963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18928 + ... + 40431.

It is an arithmetic number, because the mean of its divisors is an integer number (24290112).

Almost surely, 2^638227968 is an apocalyptic number.

It is an amenable number.

638227968 is an abundant number, since it is smaller than the sum of its proper divisors (1304980992).

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

638227968 is an equidigital number, since it uses as much as digits as its factorization.

638227968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59387 (or 59371 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 51.

The square root of 638227968 is about 25263.1741473632. The cubic root of 638227968 is about 860.9777809814.

The spelling of 638227968 in words is "six hundred thirty-eight million, two hundred twenty-seven thousand, nine hundred sixty-eight".