646646604 has 24 divisors (see below), whose sum is σ = 1533578928. Its totient is φ = 212015040.

The previous prime is 646646603. The next prime is 646646617. The reversal of 646646604 is 406646646.

It is not an unprimeable number, because it can be changed into a prime (646646603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440967 + ... + 442430.

It is an arithmetic number, because the mean of its divisors is an integer number (63899122).

Almost surely, 2^646646604 is an apocalyptic number.

It is an amenable number.

646646604 is an abundant number, since it is smaller than the sum of its proper divisors (886932324).

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

646646604 is a wasteful number, since it uses less digits than its factorization.

646646604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883465 (or 883463 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 42.

The square root of 646646604 is about 25429.2470199178. The cubic root of 646646604 is about 864.7468732651.

Adding to 646646604 its sum of digits (42), we get a palindrome (646646646).

The spelling of 646646604 in words is "six hundred forty-six million, six hundred forty-six thousand, six hundred four".