30728041 has 2 divisors, whose sum is σ = 30728042. Its totient is φ = 30728040.

The previous prime is 30728039. The next prime is 30728053. The reversal of 30728041 is 14082703.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27342441 + 3385600 = 5229^2 + 1840^2 .

It is an emirp because it is prime and its reverse (14082703) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30728041 - 2¹ = 30728039 is a prime.

Together with 30728039, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 30727997 and 30728015.

It is not a weakly prime, because it can be changed into another prime (30728641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15364020 + 15364021.

It is an arithmetic number, because the mean of its divisors is an integer number (15364021).

Almost surely, 2^30728041 is an apocalyptic number.

It is an amenable number.

30728041 is a deficient number, since it is larger than the sum of its proper divisors (1).

30728041 is an equidigital number, since it uses as much as digits as its factorization.

30728041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 30728041 is about 5543.2879232456. The cubic root of 30728041 is about 313.2167348217.

The spelling of 30728041 in words is "thirty million, seven hundred twenty-eight thousand, forty-one".