28580538 has 16 divisors (see below), whose sum is σ = 65327040. Its totient is φ = 8165856.

The previous prime is 28580533. The next prime is 28580549. The reversal of 28580538 is 83508582.

It is a junction number, because it is equal to n+sod(n) for n = 28580496 and 28580505.

It is not an unprimeable number, because it can be changed into a prime (28580533) 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, 340203 + ... + 340286.

It is an arithmetic number, because the mean of its divisors is an integer number (4082940).

Almost surely, 2^28580538 is an apocalyptic number.

28580538 is an abundant number, since it is smaller than the sum of its proper divisors (36746502).

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

28580538 is a wasteful number, since it uses less digits than its factorization.

28580538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680501.

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 28580538 is about 5346.0768793574. The cubic root of 28580538 is about 305.7431951957.

The spelling of 28580538 in words is "twenty-eight million, five hundred eighty thousand, five hundred thirty-eight".