28515841 has 2 divisors, whose sum is σ = 28515842. Its totient is φ = 28515840.

The previous prime is 28515829. The next prime is 28515871. The reversal of 28515841 is 14851582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27667600 + 848241 = 5260^2 + 921^2 .

It is a cyclic number.

It is not a de Polignac number, because 28515841 - 2¹⁵ = 28483073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28515797 and 28515806.

It is not a weakly prime, because it can be changed into another prime (28515811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14257920 + 14257921.

It is an arithmetic number, because the mean of its divisors is an integer number (14257921).

Almost surely, 2^28515841 is an apocalyptic number.

It is an amenable number.

28515841 is a deficient number, since it is larger than the sum of its proper divisors (1).

28515841 is an equidigital number, since it uses as much as digits as its factorization.

28515841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12800, while the sum is 34.

The square root of 28515841 is about 5340.0225654954. The cubic root of 28515841 is about 305.5123199995.

The spelling of 28515841 in words is "twenty-eight million, five hundred fifteen thousand, eight hundred forty-one".