28307753 has 4 divisors (see below), whose sum is σ = 28998228. Its totient is φ = 27617280.

The previous prime is 28307723. The next prime is 28307759. The reversal of 28307753 is 35770382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4959529 + 23348224 = 2227^2 + 4832^2 .

It is a cyclic number.

It is not a de Polignac number, because 28307753 - 2⁶ = 28307689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28307759) 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, 345176 + ... + 345257.

It is an arithmetic number, because the mean of its divisors is an integer number (7249557).

Almost surely, 2^28307753 is an apocalyptic number.

It is an amenable number.

28307753 is a deficient number, since it is larger than the sum of its proper divisors (690475).

28307753 is an equidigital number, since it uses as much as digits as its factorization.

28307753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690474.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 28307753 is about 5320.5030777174. The cubic root of 28307753 is about 304.7673689702.

The spelling of 28307753 in words is "twenty-eight million, three hundred seven thousand, seven hundred fifty-three".