28065729 has 8 divisors (see below), whose sum is σ = 37447200. Its totient is φ = 18697376.

The previous prime is 28065677. The next prime is 28065733. The reversal of 28065729 is 92756082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28065729 - 2⁷ = 28065601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28065029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4069 + ... + 8525.

It is an arithmetic number, because the mean of its divisors is an integer number (4680900).

Almost surely, 2^28065729 is an apocalyptic number.

It is an amenable number.

28065729 is a deficient number, since it is larger than the sum of its proper divisors (9381471).

28065729 is a wasteful number, since it uses less digits than its factorization.

28065729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6559.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 28065729 is about 5297.7097882009. The cubic root of 28065729 is about 303.8963209751.

The spelling of 28065729 in words is "twenty-eight million, sixty-five thousand, seven hundred twenty-nine".