646822220 has 24 divisors (see below), whose sum is σ = 1481811408. Its totient is φ = 235208000.

The previous prime is 646822219. The next prime is 646822249. The reversal of 646822220 is 22228646.

646822220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1469831 + ... + 1470270.

It is an arithmetic number, because the mean of its divisors is an integer number (61742142).

Almost surely, 2^646822220 is an apocalyptic number.

It is an amenable number.

646822220 is an abundant number, since it is smaller than the sum of its proper divisors (834989188).

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

646822220 is a wasteful number, since it uses less digits than its factorization.

646822220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940121 (or 2940119 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 646822220 is about 25432.6998173611. The cubic root of 646822220 is about 864.8251487046.

The spelling of 646822220 in words is "six hundred forty-six million, eight hundred twenty-two thousand, two hundred twenty".