28274729 has 4 divisors (see below), whose sum is σ = 32313984. Its totient is φ = 24235476.

The previous prime is 28274713. The next prime is 28274761. The reversal of 28274729 is 92747282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92747282 = 2 ⋅46373641.

It is a cyclic number.

It is not a de Polignac number, because 28274729 - 2⁴ = 28274713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28274329) 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, 2019617 + ... + 2019630.

It is an arithmetic number, because the mean of its divisors is an integer number (8078496).

Almost surely, 2^28274729 is an apocalyptic number.

It is an amenable number.

28274729 is a deficient number, since it is larger than the sum of its proper divisors (4039255).

28274729 is an equidigital number, since it uses as much as digits as its factorization.

28274729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039254.

The product of its digits is 112896, while the sum is 41.

The square root of 28274729 is about 5317.3987061344. The cubic root of 28274729 is about 304.6488083535.

The spelling of 28274729 in words is "twenty-eight million, two hundred seventy-four thousand, seven hundred twenty-nine".