28711585 has 8 divisors (see below), whose sum is σ = 39375936. Its totient is φ = 19687920.

The previous prime is 28711547. The next prime is 28711591. The reversal of 28711585 is 58511782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28711585 - 2¹³ = 28703393 is a prime.

It is a super-2 number, since 2×28711585² = 1648710226424450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410131 + ... + 410200.

It is an arithmetic number, because the mean of its divisors is an integer number (4921992).

Almost surely, 2^28711585 is an apocalyptic number.

It is an amenable number.

28711585 is a deficient number, since it is larger than the sum of its proper divisors (10664351).

28711585 is an equidigital number, since it uses as much as digits as its factorization.

28711585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820343.

The product of its digits is 22400, while the sum is 37.

The square root of 28711585 is about 5358.3192327445. The cubic root of 28711585 is about 306.2097789744.

The spelling of 28711585 in words is "twenty-eight million, seven hundred eleven thousand, five hundred eighty-five".