2220320644 has 12 divisors (see below), whose sum is σ = 3889419100. Its totient is φ = 1109058048.

The previous prime is 2220320621. The next prime is 2220320651. The reversal of 2220320644 is 4460230222.

It can be written as a sum of positive squares in 2 ways, for example, as 688537600 + 1531783044 = 26240^2 + 39138^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271029 + ... + 279100.

Almost surely, 2^2220320644 is an apocalyptic number.

It is an amenable number.

2220320644 is a deficient number, since it is larger than the sum of its proper divisors (1669098456).

2220320644 is a wasteful number, since it uses less digits than its factorization.

2220320644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551142 (or 551140 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 2220320644 is about 47120.2784796525. The cubic root of 2220320644 is about 1304.5835528155.

Adding to 2220320644 its reverse (4460230222), we get a palindrome (6680550866).

The spelling of 2220320644 in words is "two billion, two hundred twenty million, three hundred twenty thousand, six hundred forty-four".