645625832 has 16 divisors (see below), whose sum is σ = 1211323140. Its totient is φ = 322606336.

The previous prime is 645625831. The next prime is 645625837. The reversal of 645625832 is 238526546.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 609793636 + 35832196 = 24694^2 + 5986^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 645625832.

It is not an unprimeable number, because it can be changed into a prime (645625831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12113 + ... + 37920.

Almost surely, 2^645625832 is an apocalyptic number.

It is an amenable number.

645625832 is a deficient number, since it is larger than the sum of its proper divisors (565697308).

645625832 is a wasteful number, since it uses less digits than its factorization.

645625832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51652 (or 51648 counting only the distinct ones).

The product of its digits is 345600, while the sum is 41.

The square root of 645625832 is about 25409.1682665923. The cubic root of 645625832 is about 864.2916146699.

The spelling of 645625832 in words is "six hundred forty-five million, six hundred twenty-five thousand, eight hundred thirty-two".