645422332 has 12 divisors (see below), whose sum is σ = 1132308576. Its totient is φ = 321905600.

The previous prime is 645422317. The next prime is 645422333. The reversal of 645422332 is 233224546.

It is a junction number, because it is equal to n+sod(n) for n = 645422294 and 645422303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645422333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199588 + ... + 202795.

It is an arithmetic number, because the mean of its divisors is an integer number (94359048).

Almost surely, 2^645422332 is an apocalyptic number.

It is an amenable number.

645422332 is a deficient number, since it is larger than the sum of its proper divisors (486886244).

645422332 is a wasteful number, since it uses less digits than its factorization.

645422332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402788 (or 402786 counting only the distinct ones).

The product of its digits is 34560, while the sum is 31.

The square root of 645422332 is about 25405.1634909126. The cubic root of 645422332 is about 864.2007974517.

Adding to 645422332 its reverse (233224546), we get a palindrome (878646878).

The spelling of 645422332 in words is "six hundred forty-five million, four hundred twenty-two thousand, three hundred thirty-two".