638560 has 48 divisors (see below), whose sum is σ = 1629936. Its totient is φ = 235008.

The previous prime is 638527. The next prime is 638567. The reversal of 638560 is 65836.

638560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638567) 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, 1927 + ... + 2233.

It is an arithmetic number, because the mean of its divisors is an integer number (33957).

2⁶³⁸⁵⁶⁰ 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 638560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (814968).

638560 is an abundant number, since it is smaller than the sum of its proper divisors (991376).

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

638560 is a wasteful number, since it uses less digits than its factorization.

638560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 638560 is about 799.0994931797. The cubic root of 638560 is about 86.1127060251.

The spelling of 638560 in words is "six hundred thirty-eight thousand, five hundred sixty".