645239322 has 48 divisors (see below), whose sum is σ = 1720642560. Its totient is φ = 170172576.

The previous prime is 645239317. The next prime is 645239323. The reversal of 645239322 is 223932546.

It is a happy number.

645239322 is a `hidden beast` number, since 645 + 2 + 3 + 9 + 3 + 2 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (645239323) 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, 195322 + ... + 198597.

It is an arithmetic number, because the mean of its divisors is an integer number (35846720).

Almost surely, 2^645239322 is an apocalyptic number.

645239322 is an abundant number, since it is smaller than the sum of its proper divisors (1075403238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645239322 is a wasteful number, since it uses less digits than its factorization.

645239322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393947 (or 393944 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 645239322 is about 25401.5614087008. The cubic root of 645239322 is about 864.1191081293.

The spelling of 645239322 in words is "six hundred forty-five million, two hundred thirty-nine thousand, three hundred twenty-two".