28288541 has 2 divisors, whose sum is σ = 28288542. Its totient is φ = 28288540.

The previous prime is 28288537. The next prime is 28288571. The reversal of 28288541 is 14588282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20748025 + 7540516 = 4555^2 + 2746^2 .

It is a cyclic number.

It is not a de Polignac number, because 28288541 - 2² = 28288537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28288495 and 28288504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28288531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14144270 + 14144271.

It is an arithmetic number, because the mean of its divisors is an integer number (14144271).

Almost surely, 2^28288541 is an apocalyptic number.

It is an amenable number.

28288541 is a deficient number, since it is larger than the sum of its proper divisors (1).

28288541 is an equidigital number, since it uses as much as digits as its factorization.

28288541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40960, while the sum is 38.

The square root of 28288541 is about 5318.6973029117. The cubic root of 28288541 is about 304.6984065226.

The spelling of 28288541 in words is "twenty-eight million, two hundred eighty-eight thousand, five hundred forty-one".