645503052 has 24 divisors (see below), whose sum is σ = 1508085936. Its totient is φ = 214894528.

The previous prime is 645503051. The next prime is 645503063. The reversal of 645503052 is 250305546.

It is not an unprimeable number, because it can be changed into a prime (645503051) 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, 24183 + ... + 43310.

It is an arithmetic number, because the mean of its divisors is an integer number (62836914).

Almost surely, 2^645503052 is an apocalyptic number.

It is an amenable number.

645503052 is an abundant number, since it is smaller than the sum of its proper divisors (862582884).

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

645503052 is a wasteful number, since it uses less digits than its factorization.

645503052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68297 (or 68295 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 645503052 is about 25406.7520946696. The cubic root of 645503052 is about 864.2368231551.

Adding to 645503052 its reverse (250305546), we get a palindrome (895808598).

The spelling of 645503052 in words is "six hundred forty-five million, five hundred three thousand, fifty-two".