1222686728 has 8 divisors (see below), whose sum is σ = 2292537630. Its totient is φ = 611343360.

The previous prime is 1222686721. The next prime is 1222686743. The reversal of 1222686728 is 8276862221.

It can be written as a sum of positive squares in only one way, i.e., 1215080164 + 7606564 = 34858^2 + 2758^2 .

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 (1222686721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76417913 + ... + 76417928.

Almost surely, 2^1222686728 is an apocalyptic number.

It is an amenable number.

1222686728 is a deficient number, since it is larger than the sum of its proper divisors (1069850902).

1222686728 is a wasteful number, since it uses less digits than its factorization.

1222686728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152835847 (or 152835843 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 1222686728 is about 34966.9376411490. The cubic root of 1222686728 is about 1069.3135399550.

The spelling of 1222686728 in words is "one billion, two hundred twenty-two million, six hundred eighty-six thousand, seven hundred twenty-eight".