28138667 has 2 divisors, whose sum is σ = 28138668. Its totient is φ = 28138666.

The previous prime is 28138651. The next prime is 28138679. The reversal of 28138667 is 76683182.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28138667 - 2⁴ = 28138651 is a prime.

It is not a weakly prime, because it can be changed into another prime (28138687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14069333 + 14069334.

It is an arithmetic number, because the mean of its divisors is an integer number (14069334).

Almost surely, 2^28138667 is an apocalyptic number.

28138667 is a deficient number, since it is larger than the sum of its proper divisors (1).

28138667 is an equidigital number, since it uses as much as digits as its factorization.

28138667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 41.

The square root of 28138667 is about 5304.5892395170. The cubic root of 28138667 is about 304.1593513305.

The spelling of 28138667 in words is "twenty-eight million, one hundred thirty-eight thousand, six hundred sixty-seven".