28425785 has 8 divisors (see below), whose sum is σ = 36117576. Its totient is φ = 21402880.

The previous prime is 28425781. The next prime is 28425811. The reversal of 28425785 is 58752482.

It can be written as a sum of positive squares in 4 ways, for example, as 4032064 + 24393721 = 2008^2 + 4939^2 .

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

It is not a de Polignac number, because 28425785 - 2² = 28425781 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28425781) 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, 167126 + ... + 167295.

It is an arithmetic number, because the mean of its divisors is an integer number (4514697).

Almost surely, 2^28425785 is an apocalyptic number.

It is an amenable number.

28425785 is a deficient number, since it is larger than the sum of its proper divisors (7691791).

28425785 is a wasteful number, since it uses less digits than its factorization.

28425785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334443.

The product of its digits is 179200, while the sum is 41.

The square root of 28425785 is about 5331.5837234353. The cubic root of 28425785 is about 305.1903675846.

The spelling of 28425785 in words is "twenty-eight million, four hundred twenty-five thousand, seven hundred eighty-five".