28731305 has 8 divisors (see below), whose sum is σ = 35043144. Its totient is φ = 22608000.

The previous prime is 28731299. The next prime is 28731317. The reversal of 28731305 is 50313782.

It can be written as a sum of positive squares in 4 ways, for example, as 1315609 + 27415696 = 1147^2 + 5236^2 .

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

It is not a de Polignac number, because 28731305 - 2⁸ = 28731049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46796 + ... + 47405.

It is an arithmetic number, because the mean of its divisors is an integer number (4380393).

Almost surely, 2^28731305 is an apocalyptic number.

It is an amenable number.

28731305 is a deficient number, since it is larger than the sum of its proper divisors (6311839).

28731305 is an equidigital number, since it uses as much as digits as its factorization.

28731305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94267.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 28731305 is about 5360.1590461478. The cubic root of 28731305 is about 306.2798676965.

The spelling of 28731305 in words is "twenty-eight million, seven hundred thirty-one thousand, three hundred five".