646380100 has 36 divisors (see below), whose sum is σ = 1407917700. Its totient is φ = 257580160.

The previous prime is 646380083. The next prime is 646380131. The reversal of 646380100 is 1083646.

It can be written as a sum of positive squares in 6 ways, for example, as 407044 + 645973056 = 638^2 + 25416^2 .

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, 14886 + ... + 38914.

It is an arithmetic number, because the mean of its divisors is an integer number (39108825).

Almost surely, 2^646380100 is an apocalyptic number.

It is an amenable number.

646380100 is an abundant number, since it is smaller than the sum of its proper divisors (761537600).

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

646380100 is a wasteful number, since it uses less digits than its factorization.

646380100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24312 (or 24305 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 646380100 is about 25424.0063719312. The cubic root of 646380100 is about 864.6280602142.

The spelling of 646380100 in words is "six hundred forty-six million, three hundred eighty thousand, one hundred".