645415252 has 12 divisors (see below), whose sum is σ = 1136006676. Its totient is φ = 320841920.

The previous prime is 645415249. The next prime is 645415283. The reversal of 645415252 is 252514546.

It can be written as a sum of positive squares in 2 ways, for example, as 347300496 + 298114756 = 18636^2 + 17266^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465649 + ... + 467032.

It is an arithmetic number, because the mean of its divisors is an integer number (94667223).

Almost surely, 2^645415252 is an apocalyptic number.

It is an amenable number.

645415252 is a deficient number, since it is larger than the sum of its proper divisors (490591424).

645415252 is a wasteful number, since it uses less digits than its factorization.

645415252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932858 (or 932856 counting only the distinct ones).

The product of its digits is 48000, while the sum is 34.

The square root of 645415252 is about 25405.0241487781. The cubic root of 645415252 is about 864.1976374722.

Adding to 645415252 its reverse (252514546), we get a palindrome (897929798).

The spelling of 645415252 in words is "six hundred forty-five million, four hundred fifteen thousand, two hundred fifty-two".