28261603 has 2 divisors, whose sum is σ = 28261604. Its totient is φ = 28261602.

The previous prime is 28261601. The next prime is 28261627. The reversal of 28261603 is 30616282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28261603 - 2¹ = 28261601 is a prime.

Together with 28261601, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28261601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14130801 + 14130802.

It is an arithmetic number, because the mean of its divisors is an integer number (14130802).

Almost surely, 2^28261603 is an apocalyptic number.

28261603 is a deficient number, since it is larger than the sum of its proper divisors (1).

28261603 is an equidigital number, since it uses as much as digits as its factorization.

28261603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 28261603 is about 5316.1643127353. The cubic root of 28261603 is about 304.6016586036.

Adding to 28261603 its reverse (30616282), we get a palindrome (58877885).

The spelling of 28261603 in words is "twenty-eight million, two hundred sixty-one thousand, six hundred three".