645987012 has 48 divisors (see below), whose sum is σ = 1741061952. Its totient is φ = 184238080.

The previous prime is 645986969. The next prime is 645987037. The reversal of 645987012 is 210789546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141693 + ... + 146180.

It is an arithmetic number, because the mean of its divisors is an integer number (36272124).

Almost surely, 2^645987012 is an apocalyptic number.

It is an amenable number.

645987012 is an abundant number, since it is smaller than the sum of its proper divisors (1095074940).

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

645987012 is a wasteful number, since it uses less digits than its factorization.

645987012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287908 (or 287906 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 645987012 is about 25416.2745499808. The cubic root of 645987012 is about 864.4527537471.

The spelling of 645987012 in words is "six hundred forty-five million, nine hundred eighty-seven thousand, twelve".