28505803 has 2 divisors, whose sum is σ = 28505804. Its totient is φ = 28505802.

The previous prime is 28505801. The next prime is 28505857. The reversal of 28505803 is 30850582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28505803 - 2¹ = 28505801 is a prime.

Together with 28505801, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28505801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14252901 + 14252902.

It is an arithmetic number, because the mean of its divisors is an integer number (14252902).

Almost surely, 2^28505803 is an apocalyptic number.

28505803 is a deficient number, since it is larger than the sum of its proper divisors (1).

28505803 is an equidigital number, since it uses as much as digits as its factorization.

28505803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 28505803 is about 5339.0825990988. The cubic root of 28505803 is about 305.4764674993.

The spelling of 28505803 in words is "twenty-eight million, five hundred five thousand, eight hundred three".