28550985 has 16 divisors (see below), whose sum is σ = 46457280. Its totient is φ = 14968640.

The previous prime is 28550971. The next prime is 28550987. The reversal of 28550985 is 58905582.

It is not a de Polignac number, because 28550985 - 2⁵ = 28550953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28550987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15246 + ... + 17015.

It is an arithmetic number, because the mean of its divisors is an integer number (2903580).

Almost surely, 2^28550985 is an apocalyptic number.

It is an amenable number.

28550985 is a deficient number, since it is larger than the sum of its proper divisors (17906295).

28550985 is a wasteful number, since it uses less digits than its factorization.

28550985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32328.

The product of its (nonzero) digits is 144000, while the sum is 42.

The square root of 28550985 is about 5343.3121750465. The cubic root of 28550985 is about 305.6377767836.

The spelling of 28550985 in words is "twenty-eight million, five hundred fifty thousand, nine hundred eighty-five".