638064 has 80 divisors (see below), whose sum is σ = 2103040. Its totient is φ = 181440.

The previous prime is 638063. The next prime is 638081. The reversal of 638064 is 460836.

638064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638064.

It is not an unprimeable number, because it can be changed into a prime (638063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2919 + ... + 3129.

It is an arithmetic number, because the mean of its divisors is an integer number (26288).

2⁶³⁸⁰⁶⁴ 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 638064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1051520).

638064 is an abundant number, since it is smaller than the sum of its proper divisors (1464976).

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

638064 is a wasteful number, since it uses less digits than its factorization.

638064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 638064 is about 798.7890835508. The cubic root of 638064 is about 86.0904043016.

638064 divided by its sum of digits (27) gives a palindrome (23632).

The spelling of 638064 in words is "six hundred thirty-eight thousand, sixty-four".