646064828 has 24 divisors (see below), whose sum is σ = 1194454800. Its totient is φ = 304915968.

The previous prime is 646064801. The next prime is 646064851. The reversal of 646064828 is 828460646.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5708 + ... + 36396.

It is an arithmetic number, because the mean of its divisors is an integer number (49768950).

Almost surely, 2^646064828 is an apocalyptic number.

It is an amenable number.

646064828 is a deficient number, since it is larger than the sum of its proper divisors (548389972).

646064828 is a wasteful number, since it uses less digits than its factorization.

646064828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30989 (or 30987 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 44.

The square root of 646064828 is about 25417.8053340567. The cubic root of 646064828 is about 864.4874631935.

The spelling of 646064828 in words is "six hundred forty-six million, sixty-four thousand, eight hundred twenty-eight".