638066 has 32 divisors (see below), whose sum is σ = 1185408. Its totient is φ = 253440.

The previous prime is 638063. The next prime is 638081. The reversal of 638066 is 660836.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638063) 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, 6530 + ... + 6626.

It is an arithmetic number, because the mean of its divisors is an integer number (37044).

2⁶³⁸⁰⁶⁶ is an apocalyptic number.

638066 is a deficient number, since it is larger than the sum of its proper divisors (547342).

638066 is a wasteful number, since it uses less digits than its factorization.

638066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 638066 is about 798.7903354448. The cubic root of 638066 is about 86.0904942511.

It can be divided in two parts, 6380 and 66, that added together give a palindrome (6446).

The spelling of 638066 in words is "six hundred thirty-eight thousand, sixty-six".