645052012 has 24 divisors (see below), whose sum is σ = 1303903440. Its totient is φ = 275957760.

The previous prime is 645051983. The next prime is 645052019. The reversal of 645052012 is 210250546.

It is not an unprimeable number, because it can be changed into a prime (645052019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430437 + ... + 431932.

It is an arithmetic number, because the mean of its divisors is an integer number (54329310).

Almost surely, 2^645052012 is an apocalyptic number.

It is an amenable number.

645052012 is an abundant number, since it is smaller than the sum of its proper divisors (658851428).

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

645052012 is a wasteful number, since it uses less digits than its factorization.

645052012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862401 (or 862399 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 645052012 is about 25397.8741630082. The cubic root of 645052012 is about 864.0354834393.

The spelling of 645052012 in words is "six hundred forty-five million, fifty-two thousand, twelve".