28302785 has 8 divisors (see below), whose sum is σ = 38815296. Its totient is φ = 19407600.

The previous prime is 28302779. The next prime is 28302787. The reversal of 28302785 is 58720382.

It is a happy number.

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

It is not a de Polignac number, because 28302785 - 2⁸ = 28302529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 808651 = 28302785 / (2 + 8 + 3 + 0 + 2 + 7 + 8 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28302787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404291 + ... + 404360.

It is an arithmetic number, because the mean of its divisors is an integer number (4851912).

Almost surely, 2^28302785 is an apocalyptic number.

It is an amenable number.

28302785 is a deficient number, since it is larger than the sum of its proper divisors (10512511).

28302785 is an equidigital number, since it uses as much as digits as its factorization.

28302785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808663.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28302785 is about 5320.0361840875. The cubic root of 28302785 is about 304.7495390742.

The spelling of 28302785 in words is "twenty-eight million, three hundred two thousand, seven hundred eighty-five".