28905785 has 8 divisors (see below), whose sum is σ = 34749000. Its totient is φ = 23083264.

The previous prime is 28905757. The next prime is 28905841. The reversal of 28905785 is 58750982.

It can be written as a sum of positive squares in 4 ways, for example, as 942841 + 27962944 = 971^2 + 5288^2 .

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 28905785 - 2¹⁶ = 28840249 is a prime.

It is a Curzon number.

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, 1910 + ... + 7839.

It is an arithmetic number, because the mean of its divisors is an integer number (4343625).

Almost surely, 2^28905785 is an apocalyptic number.

It is an amenable number.

28905785 is a deficient number, since it is larger than the sum of its proper divisors (5843215).

28905785 is an equidigital number, since it uses as much as digits as its factorization.

28905785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10347.

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 28905785 is about 5376.4100476061. The cubic root of 28905785 is about 306.8986108903.

The spelling of 28905785 in words is "twenty-eight million, nine hundred five thousand, seven hundred eighty-five".