28301729 has 4 divisors (see below), whose sum is σ = 29214720. Its totient is φ = 27388740.

The previous prime is 28301723. The next prime is 28301747. The reversal of 28301729 is 92710382.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28301729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28301695 and 28301704.

It is not an unprimeable number, because it can be changed into a prime (28301723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456449 + ... + 456510.

It is an arithmetic number, because the mean of its divisors is an integer number (7303680).

Almost surely, 2^28301729 is an apocalyptic number.

It is an amenable number.

28301729 is a deficient number, since it is larger than the sum of its proper divisors (912991).

28301729 is an equidigital number, since it uses as much as digits as its factorization.

28301729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912990.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 28301729 is about 5319.9369357164. The cubic root of 28301729 is about 304.7457488758.

The spelling of 28301729 in words is "twenty-eight million, three hundred one thousand, seven hundred twenty-nine".