640233 has 24 divisors (see below), whose sum is σ = 1048320. Its totient is φ = 372960.

The previous prime is 640231. The next prime is 640247. The reversal of 640233 is 332046.

640233 is a `hidden beast` number, since 640 + 23 + 3 = 666.

640233 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640233 - 2¹ = 640231 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2760 + ... + 2982.

It is an arithmetic number, because the mean of its divisors is an integer number (43680).

2⁶⁴⁰²³³ is an apocalyptic number.

It is an amenable number.

640233 is a deficient number, since it is larger than the sum of its proper divisors (408087).

640233 is a wasteful number, since it uses less digits than its factorization.

640233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 640233 is about 800.1456117483. The cubic root of 640233 is about 86.1878443175.

Adding to 640233 its reverse (332046), we get a palindrome (972279).

The spelling of 640233 in words is "six hundred forty thousand, two hundred thirty-three".