645813052 has 12 divisors (see below), whose sum is σ = 1140735960. Its totient is φ = 319888496.

The previous prime is 645813023. The next prime is 645813053. The reversal of 645813052 is 250318546.

It is a junction number, because it is equal to n+sod(n) for n = 645812999 and 645813017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645813053) 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, 754027 + ... + 754882.

It is an arithmetic number, because the mean of its divisors is an integer number (95061330).

Almost surely, 2^645813052 is an apocalyptic number.

It is an amenable number.

645813052 is a deficient number, since it is larger than the sum of its proper divisors (494922908).

645813052 is a wasteful number, since it uses less digits than its factorization.

645813052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509020 (or 1509018 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 645813052 is about 25412.8521028239. The cubic root of 645813052 is about 864.3751496575.

The spelling of 645813052 in words is "six hundred forty-five million, eight hundred thirteen thousand, fifty-two".