645131350 has 24 divisors (see below), whose sum is σ = 1201842720. Its totient is φ = 257644320.

The previous prime is 645131329. The next prime is 645131407. The reversal of 645131350 is 53131546.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 22771 + ... + 42529.

It is an arithmetic number, because the mean of its divisors is an integer number (50076780).

Almost surely, 2^645131350 is an apocalyptic number.

645131350 is a deficient number, since it is larger than the sum of its proper divisors (556711370).

645131350 is a wasteful number, since it uses less digits than its factorization.

645131350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20424 (or 20419 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 645131350 is about 25399.4360173607. The cubic root of 645131350 is about 864.0709059249.

Adding to 645131350 its reverse (53131546), we get a palindrome (698262896).

The spelling of 645131350 in words is "six hundred forty-five million, one hundred thirty-one thousand, three hundred fifty".