7728841 has 2 divisors, whose sum is σ = 7728842. Its totient is φ = 7728840.

The previous prime is 7728803. The next prime is 7728857. The reversal of 7728841 is 1488277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7728400 + 441 = 2780^2 + 21^2 .

It is a cyclic number.

It is not a de Polignac number, because 7728841 - 2¹¹ = 7726793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7728841.

It is not a weakly prime, because it can be changed into another prime (7728871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3864420 + 3864421.

It is an arithmetic number, because the mean of its divisors is an integer number (3864421).

Almost surely, 2^7728841 is an apocalyptic number.

It is an amenable number.

7728841 is a deficient number, since it is larger than the sum of its proper divisors (1).

7728841 is an equidigital number, since it uses as much as digits as its factorization.

7728841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 37.

The square root of 7728841 is about 2780.0793154153. The cubic root of 7728841 is about 197.7143194996.

The spelling of 7728841 in words is "seven million, seven hundred twenty-eight thousand, eight hundred forty-one".