646460008 has 8 divisors (see below), whose sum is σ = 1212112530. Its totient is φ = 323230000.

The previous prime is 646459973. The next prime is 646460051. The reversal of 646460008 is 800064646.

It can be written as a sum of positive squares in only one way, i.e., 601328484 + 45131524 = 24522^2 + 6718^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40403743 + ... + 40403758.

Almost surely, 2^646460008 is an apocalyptic number.

It is an amenable number.

646460008 is a deficient number, since it is larger than the sum of its proper divisors (565652522).

646460008 is a wasteful number, since it uses less digits than its factorization.

646460008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80807507 (or 80807503 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 646460008 is about 25425.5778302087. The cubic root of 646460008 is about 864.6636882975.

The spelling of 646460008 in words is "six hundred forty-six million, four hundred sixty thousand, eight".