646320100 has 144 divisors (see below), whose sum is σ = 1526152320. Its totient is φ = 237081600.

The previous prime is 646320091. The next prime is 646320121. The reversal of 646320100 is 1023646.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8853664 + ... + 8853736.

It is an arithmetic number, because the mean of its divisors is an integer number (10598280).

Almost surely, 2^646320100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646320100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (763076160).

646320100 is an abundant number, since it is smaller than the sum of its proper divisors (879832220).

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

646320100 is a wasteful number, since it uses less digits than its factorization.

646320100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 646320100 is about 25422.8263574293. The cubic root of 646320100 is about 864.6013064569.

Adding to 646320100 its reverse (1023646), we get a palindrome (647343746).

The spelling of 646320100 in words is "six hundred forty-six million, three hundred twenty thousand, one hundred".