645038612 has 12 divisors (see below), whose sum is σ = 1159326420. Its totient is φ = 313802496.

The previous prime is 645038573. The next prime is 645038623. The reversal of 645038612 is 216830546.

It can be written as a sum of positive squares in 2 ways, for example, as 581581456 + 63457156 = 24116^2 + 7966^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2179037 + ... + 2179332.

It is an arithmetic number, because the mean of its divisors is an integer number (96610535).

Almost surely, 2^645038612 is an apocalyptic number.

It is an amenable number.

645038612 is a deficient number, since it is larger than the sum of its proper divisors (514287808).

645038612 is a wasteful number, since it uses less digits than its factorization.

645038612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4358410 (or 4358408 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 645038612 is about 25397.6103600319. The cubic root of 645038612 is about 864.0295003788.

The spelling of 645038612 in words is "six hundred forty-five million, thirty-eight thousand, six hundred twelve".