28248729 has 8 divisors (see below), whose sum is σ = 37696992. Its totient is φ = 18816480.

The previous prime is 28248707. The next prime is 28248743. The reversal of 28248729 is 92784282.

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

It is not a de Polignac number, because 28248729 - 2⁷ = 28248601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28248029) 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 7 ways as a sum of consecutive naturals, for example, 1014 + ... + 7584.

It is an arithmetic number, because the mean of its divisors is an integer number (4712124).

Almost surely, 2^28248729 is an apocalyptic number.

It is an amenable number.

28248729 is a deficient number, since it is larger than the sum of its proper divisors (9448263).

28248729 is a wasteful number, since it uses less digits than its factorization.

28248729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8007.

The product of its digits is 129024, while the sum is 42.

The square root of 28248729 is about 5314.9533394001. The cubic root of 28248729 is about 304.5553998764. Note that the first 3 decimals are identical.

The spelling of 28248729 in words is "twenty-eight million, two hundred forty-eight thousand, seven hundred twenty-nine".