1224722728 has 16 divisors (see below), whose sum is σ = 2339683380. Its totient is φ = 600807168.

The previous prime is 1224722711. The next prime is 1224722731. The reversal of 1224722728 is 8272274221.

It can be written as a sum of positive squares in 2 ways, for example, as 1149345604 + 75377124 = 33902^2 + 8682^2 .

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, 1443825 + ... + 1444672.

Almost surely, 2^1224722728 is an apocalyptic number.

It is an amenable number.

1224722728 is a deficient number, since it is larger than the sum of its proper divisors (1114960652).

1224722728 is a wasteful number, since it uses less digits than its factorization.

1224722728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888556 (or 2888552 counting only the distinct ones).

The product of its digits is 50176, while the sum is 37.

The square root of 1224722728 is about 34996.0387472640. The cubic root of 1224722728 is about 1069.9067458834.

Adding to 1224722728 its reverse (8272274221), we get a palindrome (9496996949).

The spelling of 1224722728 in words is "one billion, two hundred twenty-four million, seven hundred twenty-two thousand, seven hundred twenty-eight".