646478204 has 36 divisors (see below), whose sum is σ = 1189542816. Its totient is φ = 307388928.

The previous prime is 646478197. The next prime is 646478233. The reversal of 646478204 is 402874646.

646478204 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 407597 + ... + 409179.

It is an arithmetic number, because the mean of its divisors is an integer number (33042856).

Almost surely, 2^646478204 is an apocalyptic number.

It is an amenable number.

646478204 is a deficient number, since it is larger than the sum of its proper divisors (543064612).

646478204 is a wasteful number, since it uses less digits than its factorization.

646478204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826 (or 1801 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 41.

The square root of 646478204 is about 25425.9356563333. The cubic root of 646478204 is about 864.6718008245.

The spelling of 646478204 in words is "six hundred forty-six million, four hundred seventy-eight thousand, two hundred four".