28067747 has 4 divisors (see below), whose sum is σ = 28527936. Its totient is φ = 27607560.

The previous prime is 28067723. The next prime is 28067759. The reversal of 28067747 is 74776082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28067747 - 2¹⁰ = 28066723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28067717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230003 + ... + 230124.

It is an arithmetic number, because the mean of its divisors is an integer number (7131984).

Almost surely, 2^28067747 is an apocalyptic number.

28067747 is a deficient number, since it is larger than the sum of its proper divisors (460189).

28067747 is an equidigital number, since it uses as much as digits as its factorization.

28067747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460188.

The product of its (nonzero) digits is 131712, while the sum is 41.

The square root of 28067747 is about 5297.9002444365. The cubic root of 28067747 is about 303.9036044498.

The spelling of 28067747 in words is "twenty-eight million, sixty-seven thousand, seven hundred forty-seven".