638260 has 48 divisors (see below), whose sum is σ = 1580544. Its totient is φ = 211968.

The previous prime is 638233. The next prime is 638263. The reversal of 638260 is 62836.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6532 + ... + 6628.

It is an arithmetic number, because the mean of its divisors is an integer number (32928).

2⁶³⁸²⁶⁰ 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 638260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790272).

638260 is an abundant number, since it is smaller than the sum of its proper divisors (942284).

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

638260 is a wasteful number, since it uses less digits than its factorization.

638260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 158 counting only the distinct ones).

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

The square root of 638260 is about 798.9117598333. The cubic root of 638260 is about 86.0992184601.

It can be divided in two parts, 638 and 260, that added together give a palindrome (898).

The spelling of 638260 in words is "six hundred thirty-eight thousand, two hundred sixty".