645115452 has 24 divisors (see below), whose sum is σ = 1505826000. Its totient is φ = 214958976.

The previous prime is 645115447. The next prime is 645115459. The reversal of 645115452 is 254511546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645115459) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 30424 + ... + 47072.

It is an arithmetic number, because the mean of its divisors is an integer number (62742750).

Almost surely, 2^645115452 is an apocalyptic number.

It is an amenable number.

645115452 is an abundant number, since it is smaller than the sum of its proper divisors (860710548).

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

645115452 is a wasteful number, since it uses less digits than its factorization.

645115452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19885 (or 19883 counting only the distinct ones).

The product of its digits is 24000, while the sum is 33.

The square root of 645115452 is about 25399.1230557277. The cubic root of 645115452 is about 864.0638080876.

Adding to 645115452 its reverse (254511546), we get a palindrome (899626998).

The spelling of 645115452 in words is "six hundred forty-five million, one hundred fifteen thousand, four hundred fifty-two".