28052729 has 4 divisors (see below), whose sum is σ = 28175460. Its totient is φ = 27930000.

The previous prime is 28052681. The next prime is 28052747. The reversal of 28052729 is 92725082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27541504 + 511225 = 5248^2 + 715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28052729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28052779) 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, 61022 + ... + 61479.

It is an arithmetic number, because the mean of its divisors is an integer number (7043865).

Almost surely, 2^28052729 is an apocalyptic number.

It is an amenable number.

28052729 is a deficient number, since it is larger than the sum of its proper divisors (122731).

28052729 is a wasteful number, since it uses less digits than its factorization.

28052729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122730.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 28052729 is about 5296.4827008119. The cubic root of 28052729 is about 303.8493923015.

The spelling of 28052729 in words is "twenty-eight million, fifty-two thousand, seven hundred twenty-nine".