28357841 has 2 divisors, whose sum is σ = 28357842. Its totient is φ = 28357840.

The previous prime is 28357837. The next prime is 28357843. The reversal of 28357841 is 14875382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27867841 + 490000 = 5279^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 28357841 - 2² = 28357837 is a prime.

It is a super-3 number, since 3×28357841³ (a number of 23 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 28357843, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28357795 and 28357804.

It is not a weakly prime, because it can be changed into another prime (28357843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14178920 + 14178921.

It is an arithmetic number, because the mean of its divisors is an integer number (14178921).

Almost surely, 2^28357841 is an apocalyptic number.

It is an amenable number.

28357841 is a deficient number, since it is larger than the sum of its proper divisors (1).

28357841 is an equidigital number, since it uses as much as digits as its factorization.

28357841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 28357841 is about 5325.2080710522. The cubic root of 28357841 is about 304.9470157895.

The spelling of 28357841 in words is "twenty-eight million, three hundred fifty-seven thousand, eight hundred forty-one".