28512403 has 2 divisors, whose sum is σ = 28512404. Its totient is φ = 28512402.

The previous prime is 28512377. The next prime is 28512427. The reversal of 28512403 is 30421582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28512403 - 2⁵ = 28512371 is a prime.

It is not a weakly prime, because it can be changed into another prime (28512703) 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, 14256201 + 14256202.

It is an arithmetic number, because the mean of its divisors is an integer number (14256202).

Almost surely, 2^28512403 is an apocalyptic number.

28512403 is a deficient number, since it is larger than the sum of its proper divisors (1).

28512403 is an equidigital number, since it uses as much as digits as its factorization.

28512403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28512403 is about 5339.7006470401. The cubic root of 28512403 is about 305.5000415192.

Adding to 28512403 its reverse (30421582), we get a palindrome (58933985).

The spelling of 28512403 in words is "twenty-eight million, five hundred twelve thousand, four hundred three".