1220544644 has 24 divisors (see below), whose sum is σ = 2352762048. Its totient is φ = 549404640.

The previous prime is 1220544607. The next prime is 1220544653. The reversal of 1220544644 is 4464450221.

It is a self number, because there is not a number n which added to its sum of digits gives 1220544644.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130127 + ... + 139190.

It is an arithmetic number, because the mean of its divisors is an integer number (98031752).

Almost surely, 2^1220544644 is an apocalyptic number.

It is an amenable number.

1220544644 is a deficient number, since it is larger than the sum of its proper divisors (1132217404).

1220544644 is a wasteful number, since it uses less digits than its factorization.

1220544644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269435 (or 269433 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 32.

The square root of 1220544644 is about 34936.2940793668. The cubic root of 1220544644 is about 1068.6887142268.

Adding to 1220544644 its reverse (4464450221), we get a palindrome (5684994865).

The spelling of 1220544644 in words is "one billion, two hundred twenty million, five hundred forty-four thousand, six hundred forty-four".