28930705 has 4 divisors (see below), whose sum is σ = 34716852. Its totient is φ = 23144560.

The previous prime is 28930697. The next prime is 28930721. The reversal of 28930705 is 50703982.

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 22695696 + 6235009 = 4764^2 + 2497^2 .

It is not a de Polignac number, because 28930705 - 2³ = 28930697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2893066 + ... + 2893075.

It is an arithmetic number, because the mean of its divisors is an integer number (8679213).

Almost surely, 2^28930705 is an apocalyptic number.

It is an amenable number.

28930705 is a deficient number, since it is larger than the sum of its proper divisors (5786147).

28930705 is an equidigital number, since it uses as much as digits as its factorization.

28930705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5786146.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 28930705 is about 5378.7270798954. The cubic root of 28930705 is about 306.9867791312.

The spelling of 28930705 in words is "twenty-eight million, nine hundred thirty thousand, seven hundred five".