28745987 has 2 divisors, whose sum is σ = 28745988. Its totient is φ = 28745986.

The previous prime is 28745953. The next prime is 28746037. The reversal of 28745987 is 78954782.

It is an a-pointer prime, because the next prime (28746037) can be obtained adding 28745987 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28745987 - 2⁶ = 28745923 is a prime.

It is not a weakly prime, because it can be changed into another prime (28745687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14372993 + 14372994.

It is an arithmetic number, because the mean of its divisors is an integer number (14372994).

Almost surely, 2^28745987 is an apocalyptic number.

28745987 is a deficient number, since it is larger than the sum of its proper divisors (1).

28745987 is an equidigital number, since it uses as much as digits as its factorization.

28745987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 50.

The square root of 28745987 is about 5361.5284201429. The cubic root of 28745987 is about 306.3320295604.

The spelling of 28745987 in words is "twenty-eight million, seven hundred forty-five thousand, nine hundred eighty-seven".