638278 has 8 divisors (see below), whose sum is σ = 961272. Its totient is φ = 317856.

The previous prime is 638269. The next prime is 638303. The reversal of 638278 is 872836.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 201 + ... + 1147.

It is an arithmetic number, because the mean of its divisors is an integer number (120159).

2⁶³⁸²⁷⁸ is an apocalyptic number.

638278 is a deficient number, since it is larger than the sum of its proper divisors (322994).

638278 is a wasteful number, since it uses less digits than its factorization.

638278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286.

The product of its digits is 16128, while the sum is 34.

The square root of 638278 is about 798.9230250781. The cubic root of 638278 is about 86.1000278332.

The spelling of 638278 in words is "six hundred thirty-eight thousand, two hundred seventy-eight".