28687667 has 2 divisors, whose sum is σ = 28687668. Its totient is φ = 28687666.

The previous prime is 28687661. The next prime is 28687697. The reversal of 28687667 is 76678682.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28687667 - 2⁸ = 28687411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28687661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14343833 + 14343834.

It is an arithmetic number, because the mean of its divisors is an integer number (14343834).

Almost surely, 2^28687667 is an apocalyptic number.

28687667 is a deficient number, since it is larger than the sum of its proper divisors (1).

28687667 is an equidigital number, since it uses as much as digits as its factorization.

28687667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 50.

The square root of 28687667 is about 5356.0869111694. The cubic root of 28687667 is about 306.1247266613.

The spelling of 28687667 in words is "twenty-eight million, six hundred eighty-seven thousand, six hundred sixty-seven".