645733052 has 12 divisors (see below), whose sum is σ = 1149186360. Its totient is φ = 317394096.

The previous prime is 645733043. The next prime is 645733057. The reversal of 645733052 is 250337546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645733057) 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, 1367843 + ... + 1368314.

It is an arithmetic number, because the mean of its divisors is an integer number (95765530).

Almost surely, 2^645733052 is an apocalyptic number.

It is an amenable number.

645733052 is a deficient number, since it is larger than the sum of its proper divisors (503453308).

645733052 is a wasteful number, since it uses less digits than its factorization.

645733052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736220 (or 2736218 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 35.

The square root of 645733052 is about 25411.2780473553. The cubic root of 645733052 is about 864.3394567341.

The spelling of 645733052 in words is "six hundred forty-five million, seven hundred thirty-three thousand, fifty-two".