28409867 has 2 divisors, whose sum is σ = 28409868. Its totient is φ = 28409866.

The previous prime is 28409863. The next prime is 28409881. The reversal of 28409867 is 76890482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28409867 - 2² = 28409863 is a prime.

It is not a weakly prime, because it can be changed into another prime (28409861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14204933 + 14204934.

It is an arithmetic number, because the mean of its divisors is an integer number (14204934).

Almost surely, 2^28409867 is an apocalyptic number.

28409867 is a deficient number, since it is larger than the sum of its proper divisors (1).

28409867 is an equidigital number, since it uses as much as digits as its factorization.

28409867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 28409867 is about 5330.0907121737. The cubic root of 28409867 is about 305.1333896523.

The spelling of 28409867 in words is "twenty-eight million, four hundred nine thousand, eight hundred sixty-seven".