645252238 has 16 divisors (see below), whose sum is σ = 1048647600. Its totient is φ = 296585856.

The previous prime is 645252229. The next prime is 645252239. The reversal of 645252238 is 832252546.

645252238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 645252197 and 645252206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645252239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219213 + ... + 222136.

It is an arithmetic number, because the mean of its divisors is an integer number (65540475).

Almost surely, 2^645252238 is an apocalyptic number.

645252238 is a deficient number, since it is larger than the sum of its proper divisors (403395362).

645252238 is a wasteful number, since it uses less digits than its factorization.

645252238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441411.

The product of its digits is 115200, while the sum is 37.

The square root of 645252238 is about 25401.8156437685. The cubic root of 645252238 is about 864.1248738907.

The spelling of 645252238 in words is "six hundred forty-five million, two hundred fifty-two thousand, two hundred thirty-eight".