645403612 has 24 divisors (see below), whose sum is σ = 1291858400. Its totient is φ = 276376320.

The previous prime is 645403597. The next prime is 645403679. The reversal of 645403612 is 216304546.

645403612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28264 + ... + 45712.

Almost surely, 2^645403612 is an apocalyptic number.

It is an amenable number.

645403612 is an abundant number, since it is smaller than the sum of its proper divisors (646454788).

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

645403612 is a wasteful number, since it uses less digits than its factorization.

645403612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18781 (or 18779 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 645403612 is about 25404.7950592009. The cubic root of 645403612 is about 864.1924422014.

The spelling of 645403612 in words is "six hundred forty-five million, four hundred three thousand, six hundred twelve".