28538899 has 2 divisors, whose sum is σ = 28538900. Its totient is φ = 28538898.

The previous prime is 28538891. The next prime is 28538921. The reversal of 28538899 is 99883582.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28538899 - 2³ = 28538891 is a prime.

It is a super-2 number, since 2×28538899² = 1628937512264402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28538891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14269449 + 14269450.

It is an arithmetic number, because the mean of its divisors is an integer number (14269450).

Almost surely, 2^28538899 is an apocalyptic number.

28538899 is a deficient number, since it is larger than the sum of its proper divisors (1).

28538899 is an equidigital number, since it uses as much as digits as its factorization.

28538899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 52.

The square root of 28538899 is about 5342.1811088730. The cubic root of 28538899 is about 305.5946438932.

The spelling of 28538899 in words is "twenty-eight million, five hundred thirty-eight thousand, eight hundred ninety-nine".