638563 has 4 divisors (see below), whose sum is σ = 644328.
Its totient is φ = 632800.
The previous prime is 638527. The next prime is 638567. The reversal of 638563 is 365836.
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 638563 - 29 = 638051 is a prime.
It is an Ulam number.
It is a d-powerful number, because it can be written as 67 + 33 + 57 + 83 + 67 + 33 .
It is an alternating number because its digits alternate between even and odd.
It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 2713 + ... + 2938.
It is an arithmetic number, because the mean of its divisors is an integer number (161082).
2638563 is an apocalyptic number.
638563 is a deficient number, since it is larger than the sum of its proper divisors (5765).
638563 is a wasteful number, since it uses less digits than its factorization.
638563 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5764.
The product of its digits is 12960, while the sum is 31.
The square root of 638563 is about 799.1013702904.
The cubic root of 638563 is about 86.1128408794.
The spelling of 638563 in words is "six hundred thirty-eight thousand, five hundred sixty-three".