638248 has 48 divisors (see below), whose sum is σ = 1440180. Its totient is φ = 262656.

The previous prime is 638233. The next prime is 638263. The reversal of 638248 is 842836.

It is a happy number.

638248 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (638233) and next prime (638263).

It can be written as a sum of positive squares in 2 ways, for example, as 636804 + 1444 = 798^2 + 38^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33583 + ... + 33601.

2⁶³⁸²⁴⁸ is an apocalyptic number.

638248 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (720090).

638248 is an abundant number, since it is smaller than the sum of its proper divisors (801932).

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

638248 is a wasteful number, since it uses less digits than its factorization.

638248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 51 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 638248 is about 798.9042495819. The cubic root of 638248 is about 86.0986788696.

The spelling of 638248 in words is "six hundred thirty-eight thousand, two hundred forty-eight".