646380364 has 18 divisors (see below), whose sum is σ = 1315846140. Its totient is φ = 277020072.

The previous prime is 646380313. The next prime is 646380377. The reversal of 646380364 is 463083646.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1648734 + ... + 1649125.

Almost surely, 2^646380364 is an apocalyptic number.

It is an amenable number.

646380364 is an abundant number, since it is smaller than the sum of its proper divisors (669465776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646380364 is a wasteful number, since it uses less digits than its factorization.

646380364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3297877 (or 3297868 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 646380364 is about 25424.0115638740. The cubic root of 646380364 is about 864.6281779270.

The spelling of 646380364 in words is "six hundred forty-six million, three hundred eighty thousand, three hundred sixty-four".