640206022 has 16 divisors (see below), whose sum is σ = 965160000. Its totient is φ = 318490920.

The previous prime is 640206011. The next prime is 640206071. The reversal of 640206022 is 220602046.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 640205984 and 640206002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417397 + ... + 418927.

It is an arithmetic number, because the mean of its divisors is an integer number (60322500).

Almost surely, 2^640206022 is an apocalyptic number.

640206022 is a deficient number, since it is larger than the sum of its proper divisors (324953978).

640206022 is a wasteful number, since it uses less digits than its factorization.

640206022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 640206022 is about 25302.2928210073. The cubic root of 640206022 is about 861.8663371220.

Adding to 640206022 its reverse (220602046), we get a palindrome (860808068).

The spelling of 640206022 in words is "six hundred forty million, two hundred six thousand, twenty-two".