28301705 has 4 divisors (see below), whose sum is σ = 33962052. Its totient is φ = 22641360.

The previous prime is 28301701. The next prime is 28301711. The reversal of 28301705 is 50710382.

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 19035769 + 9265936 = 4363^2 + 3044^2 .

It is not a de Polignac number, because 28301705 - 2² = 28301701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28301701) 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, 2830166 + ... + 2830175.

It is an arithmetic number, because the mean of its divisors is an integer number (8490513).

Almost surely, 2^28301705 is an apocalyptic number.

It is an amenable number.

28301705 is a deficient number, since it is larger than the sum of its proper divisors (5660347).

28301705 is an equidigital number, since it uses as much as digits as its factorization.

28301705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5660346.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 28301705 is about 5319.9346800501. The cubic root of 28301705 is about 304.7456627338.

The spelling of 28301705 in words is "twenty-eight million, three hundred one thousand, seven hundred five".