638090 has 8 divisors (see below), whose sum is σ = 1148580. Its totient is φ = 255232.

The previous prime is 638081. The next prime is 638117. The reversal of 638090 is 90836.

It is a happy number.

638090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 528529 + 109561 = 727^2 + 331^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31895 + ... + 31914.

2⁶³⁸⁰⁹⁰ is an apocalyptic number.

638090 is a deficient number, since it is larger than the sum of its proper divisors (510490).

638090 is a wasteful number, since it uses less digits than its factorization.

638090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63816.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 638090 is about 798.8053580191. The cubic root of 638090 is about 86.0915736305.

The spelling of 638090 in words is "six hundred thirty-eight thousand, ninety".