7728361 has 2 divisors, whose sum is σ = 7728362. Its totient is φ = 7728360.

The previous prime is 7728359. The next prime is 7728367. The reversal of 7728361 is 1638277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4648336 + 3080025 = 2156^2 + 1755^2 .

It is a cyclic number.

It is not a de Polignac number, because 7728361 - 2¹ = 7728359 is a prime.

Together with 7728359, it forms a pair of twin primes.

7728361 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7728367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3864180 + 3864181.

It is an arithmetic number, because the mean of its divisors is an integer number (3864181).

Almost surely, 2^7728361 is an apocalyptic number.

It is an amenable number.

7728361 is a deficient number, since it is larger than the sum of its proper divisors (1).

7728361 is an equidigital number, since it uses as much as digits as its factorization.

7728361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 34.

The square root of 7728361 is about 2779.9929856027. The cubic root of 7728361 is about 197.7102263961.

The spelling of 7728361 in words is "seven million, seven hundred twenty-eight thousand, three hundred sixty-one".