646341856 has 12 divisors (see below), whose sum is σ = 1272485592. Its totient is φ = 323170912.

The previous prime is 646341841. The next prime is 646341877. The reversal of 646341856 is 658143646.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10099060 + ... + 10099123.

It is an arithmetic number, because the mean of its divisors is an integer number (106040466).

Almost surely, 2^646341856 is an apocalyptic number.

It is an amenable number.

646341856 is a deficient number, since it is larger than the sum of its proper divisors (626143736).

646341856 is a wasteful number, since it uses less digits than its factorization.

646341856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20198193 (or 20198185 counting only the distinct ones).

The product of its digits is 414720, while the sum is 43.

The square root of 646341856 is about 25423.2542370169. The cubic root of 646341856 is about 864.6110075606.

The spelling of 646341856 in words is "six hundred forty-six million, three hundred forty-one thousand, eight hundred fifty-six".