646967808 has 60 divisors (see below), whose sum is σ = 1867206198. Its totient is φ = 215654400.

The previous prime is 646967807. The next prime is 646967821. The reversal of 646967808 is 808769646.

It can be written as a sum of positive squares in only one way, i.e., 644753664 + 2214144 = 25392^2 + 1488^2 .

It is not an unprimeable number, because it can be changed into a prime (646967801) 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 5 ways as a sum of consecutive naturals, for example, 65593 + ... + 74808.

Almost surely, 2^646967808 is an apocalyptic number.

It is an amenable number.

646967808 is an abundant number, since it is smaller than the sum of its proper divisors (1220238390).

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

646967808 is a wasteful number, since it uses less digits than its factorization.

646967808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140425 (or 140406 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The square root of 646967808 is about 25435.5618770256. The cubic root of 646967808 is about 864.8900293444.

The spelling of 646967808 in words is "six hundred forty-six million, nine hundred sixty-seven thousand, eight hundred eight".