645583828 has 12 divisors (see below), whose sum is σ = 1132852672. Its totient is φ = 321911640.

The previous prime is 645583769. The next prime is 645583889. The reversal of 645583828 is 828385546.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 218418 + ... + 221353.

Almost surely, 2^645583828 is an apocalyptic number.

It is an amenable number.

645583828 is a deficient number, since it is larger than the sum of its proper divisors (487268844).

645583828 is a wasteful number, since it uses less digits than its factorization.

645583828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440142 (or 440140 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 49.

The square root of 645583828 is about 25408.3417011028. The cubic root of 645583828 is about 864.2728708451.

It can be divided in two parts, 64558 and 3828, that added together give a palindrome (68386).

The spelling of 645583828 in words is "six hundred forty-five million, five hundred eighty-three thousand, eight hundred twenty-eight".