638012032 has 32 divisors (see below), whose sum is σ = 1452618720. Its totient is φ = 273433344.

The previous prime is 638011991. The next prime is 638012033. The reversal of 638012032 is 230210836.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 638011988 and 638012006.

It is not an unprimeable number, because it can be changed into a prime (638012033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355138 + ... + 356929.

It is an arithmetic number, because the mean of its divisors is an integer number (45394335).

Almost surely, 2^638012032 is an apocalyptic number.

It is an amenable number.

638012032 is an abundant number, since it is smaller than the sum of its proper divisors (814606688).

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

638012032 is an equidigital number, since it uses as much as digits as its factorization.

638012032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712088 (or 712076 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 638012032 is about 25258.9000552281. The cubic root of 638012032 is about 860.8806698765.

Adding to 638012032 its reverse (230210836), we get a palindrome (868222868).

The spelling of 638012032 in words is "six hundred thirty-eight million, twelve thousand, thirty-two".