638530560 has 352 divisors, whose sum is σ = 2358144000. Its totient is φ = 163676160.

The previous prime is 638530517. The next prime is 638530561. The reversal of 638530560 is 65035836.

638530560 is a `hidden beast` number, since 63 + 8 + 5 + 30 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638530561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4285366 + ... + 4285514.

Almost surely, 2^638530560 is an apocalyptic number.

638530560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638530560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1179072000).

638530560 is an abundant number, since it is smaller than the sum of its proper divisors (1719613440).

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

638530560 is a wasteful number, since it uses less digits than its factorization.

638530560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 638530560 is about 25269.1622338375. The cubic root of 638530560 is about 861.1138263236.

The spelling of 638530560 in words is "six hundred thirty-eight million, five hundred thirty thousand, five hundred sixty".