28520858 has 8 divisors (see below), whose sum is σ = 43937652. Its totient is φ = 13874976.

The previous prime is 28520857. The next prime is 28520867. The reversal of 28520858 is 85802582.

It can be written as a sum of positive squares in 2 ways, for example, as 26759929 + 1760929 = 5173^2 + 1327^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28520857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192635 + ... + 192782.

Almost surely, 2^28520858 is an apocalyptic number.

28520858 is a deficient number, since it is larger than the sum of its proper divisors (15416794).

28520858 is a wasteful number, since it uses less digits than its factorization.

28520858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385456.

The product of its (nonzero) digits is 51200, while the sum is 38.

The square root of 28520858 is about 5340.4922994046. The cubic root of 28520858 is about 305.5302359528.

The spelling of 28520858 in words is "twenty-eight million, five hundred twenty thousand, eight hundred fifty-eight".