28381667 has 2 divisors, whose sum is σ = 28381668. Its totient is φ = 28381666.

The previous prime is 28381663. The next prime is 28381673. The reversal of 28381667 is 76618382.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28381667 - 2² = 28381663 is a prime.

It is not a weakly prime, because it can be changed into another prime (28381663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14190833 + 14190834.

It is an arithmetic number, because the mean of its divisors is an integer number (14190834).

Almost surely, 2^28381667 is an apocalyptic number.

28381667 is a deficient number, since it is larger than the sum of its proper divisors (1).

28381667 is an equidigital number, since it uses as much as digits as its factorization.

28381667 is an evil number, because the sum of its binary digits is even.

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

The square root of 28381667 is about 5327.4446970382. Note that the first 3 decimals coincide. The cubic root of 28381667 is about 305.0323964513.

The spelling of 28381667 in words is "twenty-eight million, three hundred eighty-one thousand, six hundred sixty-seven".