28580316 has 12 divisors (see below), whose sum is σ = 66687432. Its totient is φ = 9526768.

The previous prime is 28580311. The next prime is 28580333. The reversal of 28580316 is 61308582.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28580311) 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, 1190835 + ... + 1190858.

It is an arithmetic number, because the mean of its divisors is an integer number (5557286).

Almost surely, 2^28580316 is an apocalyptic number.

It is an amenable number.

28580316 is an abundant number, since it is smaller than the sum of its proper divisors (38107116).

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

28580316 is a wasteful number, since it uses less digits than its factorization.

28580316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381700 (or 2381698 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28580316 is about 5346.0561164283. The cubic root of 28580316 is about 305.7424035711.

Adding to 28580316 its reverse (61308582), we get a palindrome (89888898).

It can be divided in two parts, 285 and 80316, that added together give a triangular number (80601 = T₄₀₁).

The spelling of 28580316 in words is "twenty-eight million, five hundred eighty thousand, three hundred sixteen".