646006904 has 16 divisors (see below), whose sum is σ = 1212035400. Its totient is φ = 322797472.

The previous prime is 646006903. The next prime is 646006943. The reversal of 646006904 is 409600646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646006903) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 11987 + ... + 37890.

Almost surely, 2^646006904 is an apocalyptic number.

It is an amenable number.

646006904 is a deficient number, since it is larger than the sum of its proper divisors (566028496).

646006904 is a wasteful number, since it uses less digits than its factorization.

646006904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51502 (or 51498 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 646006904 is about 25416.6658710382. The cubic root of 646006904 is about 864.4616267416.

The spelling of 646006904 in words is "six hundred forty-six million, six thousand, nine hundred four".