645429748 has 12 divisors (see below), whose sum is σ = 1138396672. Its totient is φ = 320173560.

The previous prime is 645429737. The next prime is 645429751. The reversal of 645429748 is 847924546.

It is a congruent number.

It is an unprimeable number.

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, 634758 + ... + 635773.

Almost surely, 2^645429748 is an apocalyptic number.

It is an amenable number.

645429748 is a deficient number, since it is larger than the sum of its proper divisors (492966924).

645429748 is a wasteful number, since it uses less digits than its factorization.

645429748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270662 (or 1270660 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 49.

The square root of 645429748 is about 25405.3094450747. The cubic root of 645429748 is about 864.2041073715.

The spelling of 645429748 in words is "six hundred forty-five million, four hundred twenty-nine thousand, seven hundred forty-eight".