638164 has 6 divisors (see below), whose sum is σ = 1116794. Its totient is φ = 319080.

The previous prime is 638161. The next prime is 638171. The reversal of 638164 is 461836.

It can be written as a sum of positive squares in only one way, i.e., 501264 + 136900 = 708^2 + 370^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638161) 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 as a sum of consecutive naturals, namely, 79767 + ... + 79774.

2⁶³⁸¹⁶⁴ is an apocalyptic number.

It is an amenable number.

638164 is a deficient number, since it is larger than the sum of its proper divisors (478630).

638164 is a wasteful number, since it uses less digits than its factorization.

638164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159545 (or 159543 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 638164 is about 798.8516758448. The cubic root of 638164 is about 86.0949015467.

The spelling of 638164 in words is "six hundred thirty-eight thousand, one hundred sixty-four".