28735705 has 4 divisors (see below), whose sum is σ = 34482852. Its totient is φ = 22988560.

The previous prime is 28735691. The next prime is 28735709. The reversal of 28735705 is 50753782.

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 12187081 + 16548624 = 3491^2 + 4068^2 .

It is not a de Polignac number, because 28735705 - 2⁹ = 28735193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28735709) 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, 2873566 + ... + 2873575.

It is an arithmetic number, because the mean of its divisors is an integer number (8620713).

Almost surely, 2^28735705 is an apocalyptic number.

It is an amenable number.

28735705 is a deficient number, since it is larger than the sum of its proper divisors (5747147).

28735705 is an equidigital number, since it uses as much as digits as its factorization.

28735705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5747146.

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 28735705 is about 5360.5694660176. The cubic root of 28735705 is about 306.2955017772.

The spelling of 28735705 in words is "twenty-eight million, seven hundred thirty-five thousand, seven hundred five".