28685571 has 8 divisors (see below), whose sum is σ = 39481344. Its totient is φ = 18506760.

The previous prime is 28685567. The next prime is 28685597. The reversal of 28685571 is 17558682.

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

It is not a de Polignac number, because 28685571 - 2² = 28685567 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28685521) 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, 154131 + ... + 154316.

It is an arithmetic number, because the mean of its divisors is an integer number (4935168).

Almost surely, 2^28685571 is an apocalyptic number.

28685571 is a deficient number, since it is larger than the sum of its proper divisors (10795773).

28685571 is a wasteful number, since it uses less digits than its factorization.

28685571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308481.

The product of its digits is 134400, while the sum is 42.

The square root of 28685571 is about 5355.8912423611. The cubic root of 28685571 is about 306.1172710410.

The spelling of 28685571 in words is "twenty-eight million, six hundred eighty-five thousand, five hundred seventy-one".