1222220072 has 8 divisors (see below), whose sum is σ = 2291662650. Its totient is φ = 611110032.

The previous prime is 1222220071. The next prime is 1222220081. The reversal of 1222220072 is 2700222221.

It can be written as a sum of positive squares in only one way, i.e., 1193426116 + 28793956 = 34546^2 + 5366^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1222220071) 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 as a sum of consecutive naturals, namely, 76388747 + ... + 76388762.

Almost surely, 2^1222220072 is an apocalyptic number.

It is an amenable number.

1222220072 is a deficient number, since it is larger than the sum of its proper divisors (1069442578).

1222220072 is a wasteful number, since it uses less digits than its factorization.

1222220072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152777515 (or 152777511 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 1222220072 is about 34960.2641866448. The cubic root of 1222220072 is about 1069.1774830063.

Adding to 1222220072 its reverse (2700222221), we get a palindrome (3922442293).

The spelling of 1222220072 in words is "one billion, two hundred twenty-two million, two hundred twenty thousand, seventy-two".