646488620 has 12 divisors (see below), whose sum is σ = 1357626144. Its totient is φ = 258595440.

The previous prime is 646488599. The next prime is 646488629. The reversal of 646488620 is 26884646.

It is not an unprimeable number, because it can be changed into a prime (646488629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16162196 + ... + 16162235.

It is an arithmetic number, because the mean of its divisors is an integer number (113135512).

Almost surely, 2^646488620 is an apocalyptic number.

It is an amenable number.

646488620 is an abundant number, since it is smaller than the sum of its proper divisors (711137524).

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

646488620 is a wasteful number, since it uses less digits than its factorization.

646488620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32324440 (or 32324438 counting only the distinct ones).

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

The square root of 646488620 is about 25426.1404857285. The cubic root of 646488620 is about 864.6764446382.

The spelling of 646488620 in words is "six hundred forty-six million, four hundred eighty-eight thousand, six hundred twenty".