28520851 has 8 divisors (see below), whose sum is σ = 30097440. Its totient is φ = 26972352.

The previous prime is 28520839. The next prime is 28520857. The reversal of 28520851 is 15802582.

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 28520851 - 2²³ = 20132243 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 4920 + ... + 9013.

It is an arithmetic number, because the mean of its divisors is an integer number (3762180).

Almost surely, 2^28520851 is an apocalyptic number.

28520851 is a deficient number, since it is larger than the sum of its proper divisors (1576589).

28520851 is a wasteful number, since it uses less digits than its factorization.

28520851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14045.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 28520851 is about 5340.4916440343. The cubic root of 28520851 is about 305.5302109569.

The spelling of 28520851 in words is "twenty-eight million, five hundred twenty thousand, eight hundred fifty-one".