645252874 has 12 divisors (see below), whose sum is σ = 1125900594. Its totient is φ = 276536904.

The previous prime is 645252857. The next prime is 645252967. The reversal of 645252874 is 478252546.

It is a happy number.

645252874 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 439531225 + 205721649 = 20965^2 + 14343^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 645252874.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3292009 + ... + 3292204.

Almost surely, 2^645252874 is an apocalyptic number.

645252874 is a deficient number, since it is larger than the sum of its proper divisors (480647720).

645252874 is a wasteful number, since it uses less digits than its factorization.

645252874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6584229 (or 6584222 counting only the distinct ones).

The product of its digits is 537600, while the sum is 43.

The square root of 645252874 is about 25401.8281625555. The cubic root of 645252874 is about 864.1251578020.

The spelling of 645252874 in words is "six hundred forty-five million, two hundred fifty-two thousand, eight hundred seventy-four".