28757147 has 2 divisors, whose sum is σ = 28757148. Its totient is φ = 28757146.

The previous prime is 28757129. The next prime is 28757159. The reversal of 28757147 is 74175782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28757147 - 2⁶ = 28757083 is a prime.

It is not a weakly prime, because it can be changed into another prime (28757117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14378573 + 14378574.

It is an arithmetic number, because the mean of its divisors is an integer number (14378574).

Almost surely, 2^28757147 is an apocalyptic number.

28757147 is a deficient number, since it is larger than the sum of its proper divisors (1).

28757147 is an equidigital number, since it uses as much as digits as its factorization.

28757147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 109760, while the sum is 41.

The square root of 28757147 is about 5362.5690671543. The cubic root of 28757147 is about 306.3716666656.

The spelling of 28757147 in words is "twenty-eight million, seven hundred fifty-seven thousand, one hundred forty-seven".