645543052 has 36 divisors (see below), whose sum is σ = 1433613384. Its totient is φ = 251509440.

The previous prime is 645543029. The next prime is 645543071. The reversal of 645543052 is 250345546.

It is a junction number, because it is equal to n+sod(n) for n = 645542999 and 645543017.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147553 + ... + 151864.

It is an arithmetic number, because the mean of its divisors is an integer number (39822594).

Almost surely, 2^645543052 is an apocalyptic number.

It is an amenable number.

645543052 is an abundant number, since it is smaller than the sum of its proper divisors (788070332).

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

645543052 is a wasteful number, since it uses less digits than its factorization.

645543052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299446 (or 299437 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

The square root of 645543052 is about 25407.5392747901. The cubic root of 645543052 is about 864.2546742242.

Adding to 645543052 its reverse (250345546), we get a palindrome (895888598).

The spelling of 645543052 in words is "six hundred forty-five million, five hundred forty-three thousand, fifty-two".