7632721 has 2 divisors, whose sum is σ = 7632722. Its totient is φ = 7632720.

The previous prime is 7632719. The next prime is 7632731. The reversal of 7632721 is 1272367.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7049025 + 583696 = 2655^2 + 764^2 .

It is an emirp because it is prime and its reverse (1272367) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7632721 - 2¹ = 7632719 is a prime.

Together with 7632719, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 7632721.

It is not a weakly prime, because it can be changed into another prime (7632701) 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, 3816360 + 3816361.

It is an arithmetic number, because the mean of its divisors is an integer number (3816361).

Almost surely, 2^7632721 is an apocalyptic number.

It is an amenable number.

7632721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7632721 is an equidigital number, since it uses as much as digits as its factorization.

7632721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 28.

The square root of 7632721 is about 2762.7379535526. The cubic root of 7632721 is about 196.8912710496.

The spelling of 7632721 in words is "seven million, six hundred thirty-two thousand, seven hundred twenty-one".