28705305 has 8 divisors (see below), whose sum is σ = 45928512. Its totient is φ = 15309488.

The previous prime is 28705267. The next prime is 28705321. The reversal of 28705305 is 50350782.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28705305 - 2⁸ = 28705049 is a prime.

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, 956829 + ... + 956858.

It is an arithmetic number, because the mean of its divisors is an integer number (5741064).

Almost surely, 2^28705305 is an apocalyptic number.

It is an amenable number.

28705305 is a deficient number, since it is larger than the sum of its proper divisors (17223207).

28705305 is a wasteful number, since it uses less digits than its factorization.

28705305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913695.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 28705305 is about 5357.7331960448. The cubic root of 28705305 is about 306.1874518936.

The spelling of 28705305 in words is "twenty-eight million, seven hundred five thousand, three hundred five".