7288752721 has 2 divisors, whose sum is σ = 7288752722. Its totient is φ = 7288752720.

The previous prime is 7288752701. The next prime is 7288752727. The reversal of 7288752721 is 1272578827.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7163760321 + 124992400 = 84639^2 + 11180^2 .

It is a cyclic number.

It is not a de Polignac number, because 7288752721 - 2⁷ = 7288752593 is a prime.

It is not a weakly prime, because it can be changed into another prime (7288752727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3644376360 + 3644376361.

It is an arithmetic number, because the mean of its divisors is an integer number (3644376361).

Almost surely, 2^7288752721 is an apocalyptic number.

It is an amenable number.

7288752721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7288752721 is an equidigital number, since it uses as much as digits as its factorization.

7288752721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 878080, while the sum is 49.

The square root of 7288752721 is about 85374.1923592838. The cubic root of 7288752721 is about 1938.8806311351.

The spelling of 7288752721 in words is "seven billion, two hundred eighty-eight million, seven hundred fifty-two thousand, seven hundred twenty-one".