645364250 has 16 divisors (see below), whose sum is σ = 1208122344. Its totient is φ = 258145600.

The previous prime is 645364229. The next prime is 645364261. The reversal of 645364250 is 52463546.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 348456889 + 296907361 = 18667^2 + 17231^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 645364250.

It is an unprimeable number.

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, 1290479 + ... + 1290978.

Almost surely, 2^645364250 is an apocalyptic number.

645364250 is a deficient number, since it is larger than the sum of its proper divisors (562758094).

645364250 is a wasteful number, since it uses less digits than its factorization.

645364250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581474 (or 2581464 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 645364250 is about 25404.0203511177. The cubic root of 645364250 is about 864.1748733324.

It can be divided in two parts, 64536 and 4250, that added together give a palindrome (68786).

The spelling of 645364250 in words is "six hundred forty-five million, three hundred sixty-four thousand, two hundred fifty".