640422333 has 6 divisors (see below), whose sum is σ = 925054494. Its totient is φ = 426948216.

The previous prime is 640422319. The next prime is 640422353. The reversal of 640422333 is 333224046.

It is a happy number.

640422333 is a `hidden beast` number, since 6 + 404 + 223 + 33 = 666.

It can be written as a sum of positive squares in only one way, i.e., 478165689 + 162256644 = 21867^2 + 12738^2 .

It is not a de Polignac number, because 640422333 - 2⁵ = 640422301 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 640422297 and 640422306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640422313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35579010 + ... + 35579027.

It is an arithmetic number, because the mean of its divisors is an integer number (154175749).

Almost surely, 2^640422333 is an apocalyptic number.

It is an amenable number.

640422333 is a deficient number, since it is larger than the sum of its proper divisors (284632161).

640422333 is a wasteful number, since it uses less digits than its factorization.

640422333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71158043 (or 71158040 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

The square root of 640422333 is about 25306.5669935691. The cubic root of 640422333 is about 861.9633945118.

Adding to 640422333 its reverse (333224046), we get a palindrome (973646379).

The spelling of 640422333 in words is "six hundred forty million, four hundred twenty-two thousand, three hundred thirty-three".