646825568 has 24 divisors (see below), whose sum is σ = 1297468368. Its totient is φ = 317309824.

The previous prime is 646825561. The next prime is 646825583. The reversal of 646825568 is 865528646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646825561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188996 + ... + 192387.

It is an arithmetic number, because the mean of its divisors is an integer number (54061182).

Almost surely, 2^646825568 is an apocalyptic number.

It is an amenable number.

646825568 is an abundant number, since it is smaller than the sum of its proper divisors (650642800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646825568 is a wasteful number, since it uses less digits than its factorization.

646825568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381446 (or 381438 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 50.

The square root of 646825568 is about 25432.7656380505. The cubic root of 646825568 is about 864.8266408351.

The spelling of 646825568 in words is "six hundred forty-six million, eight hundred twenty-five thousand, five hundred sixty-eight".