28402307 has 2 divisors, whose sum is σ = 28402308. Its totient is φ = 28402306.

The previous prime is 28402289. The next prime is 28402313. The reversal of 28402307 is 70320482.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28402307 is a prime.

It is not a weakly prime, because it can be changed into another prime (28402337) 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, 14201153 + 14201154.

It is an arithmetic number, because the mean of its divisors is an integer number (14201154).

Almost surely, 2^28402307 is an apocalyptic number.

28402307 is a deficient number, since it is larger than the sum of its proper divisors (1).

28402307 is an equidigital number, since it uses as much as digits as its factorization.

28402307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 28402307 is about 5329.3814838122. The cubic root of 28402307 is about 305.1063214384.

Adding to 28402307 its reverse (70320482), we get a palindrome (98722789).

The spelling of 28402307 in words is "twenty-eight million, four hundred two thousand, three hundred seven".