28520136 has 48 divisors (see below), whose sum is σ = 77875200. Its totient is φ = 9428832.

The previous prime is 28520131. The next prime is 28520143. The reversal of 28520136 is 63102582.

28520136 is a `hidden beast` number, since 2 + 8 + 520 + 136 = 666.

It is not an unprimeable number, because it can be changed into a prime (28520131) 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 11 ways as a sum of consecutive naturals, for example, 7585 + ... + 10703.

It is an arithmetic number, because the mean of its divisors is an integer number (1622400).

Almost surely, 2^28520136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28520136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38937600).

28520136 is an abundant number, since it is smaller than the sum of its proper divisors (49355064).

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

28520136 is a wasteful number, since it uses less digits than its factorization.

28520136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3258 (or 3251 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28520136 is about 5340.4247022124. The cubic root of 28520136 is about 305.5276577848.

The spelling of 28520136 in words is "twenty-eight million, five hundred twenty thousand, one hundred thirty-six".