28005667 has 2 divisors, whose sum is σ = 28005668. Its totient is φ = 28005666.

The previous prime is 28005661. The next prime is 28005683. The reversal of 28005667 is 76650082.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28005667 is a prime.

It is a super-2 number, since 2×28005667² = 1568634768229778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28005661) 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, 14002833 + 14002834.

It is an arithmetic number, because the mean of its divisors is an integer number (14002834).

Almost surely, 2^28005667 is an apocalyptic number.

28005667 is a deficient number, since it is larger than the sum of its proper divisors (1).

28005667 is an equidigital number, since it uses as much as digits as its factorization.

28005667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 28005667 is about 5292.0380762047. The cubic root of 28005667 is about 303.6793819362.

The spelling of 28005667 in words is "twenty-eight million, five thousand, six hundred sixty-seven".