28947729 has 8 divisors (see below), whose sum is σ = 39494752. Its totient is φ = 18849600.

The previous prime is 28947691. The next prime is 28947739. The reversal of 28947729 is 92774982.

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

It is not a de Polignac number, because 28947729 - 2⁷ = 28947601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28947739) 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, 112072 + ... + 112329.

It is an arithmetic number, because the mean of its divisors is an integer number (4936844).

Almost surely, 2^28947729 is an apocalyptic number.

It is an amenable number.

28947729 is a deficient number, since it is larger than the sum of its proper divisors (10547023).

28947729 is a wasteful number, since it uses less digits than its factorization.

28947729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224447.

The product of its digits is 508032, while the sum is 48.

The square root of 28947729 is about 5380.3093777217. The cubic root of 28947729 is about 307.0469818141.

The spelling of 28947729 in words is "twenty-eight million, nine hundred forty-seven thousand, seven hundred twenty-nine".