1224340728 has 64 divisors (see below), whose sum is σ = 3300393600. Its totient is φ = 376252800.

The previous prime is 1224340723. The next prime is 1224340739. The reversal of 1224340728 is 8270434221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224340721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316003 + ... + 319853.

It is an arithmetic number, because the mean of its divisors is an integer number (51568650).

Almost surely, 2^1224340728 is an apocalyptic number.

It is an amenable number.

1224340728 is an abundant number, since it is smaller than the sum of its proper divisors (2076052872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1224340728 is a wasteful number, since it uses less digits than its factorization.

1224340728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4892 (or 4888 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 1224340728 is about 34990.5805610596. The cubic root of 1224340728 is about 1069.7954970628.

Adding to 1224340728 its reverse (8270434221), we get a palindrome (9494774949).

The spelling of 1224340728 in words is "one billion, two hundred twenty-four million, three hundred forty thousand, seven hundred twenty-eight".