28520850 has 48 divisors (see below), whose sum is σ = 71432928. Its totient is φ = 7530240.

The previous prime is 28520839. The next prime is 28520857. The reversal of 28520850 is 5802582.

It is a Harshad number since it is a multiple of its sum of digits (30).

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

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15162 + ... + 16938.

It is an arithmetic number, because the mean of its divisors is an integer number (1488186).

Almost surely, 2^28520850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28520850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35716464).

28520850 is an abundant number, since it is smaller than the sum of its proper divisors (42912078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28520850 is a wasteful number, since it uses less digits than its factorization.

28520850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899 (or 1894 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 28520850 is about 5340.4915504099. The cubic root of 28520850 is about 305.5302073861.

The spelling of 28520850 in words is "twenty-eight million, five hundred twenty thousand, eight hundred fifty".