28857685 has 8 divisors (see below), whose sum is σ = 34673976. Its totient is φ = 23056320.

The previous prime is 28857643. The next prime is 28857701. The reversal of 28857685 is 58675882.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3837681 + 25020004 = 1959^2 + 5002^2 .

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

It is not a de Polignac number, because 28857685 - 2¹⁹ = 28333397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1095 + ... + 7675.

It is an arithmetic number, because the mean of its divisors is an integer number (4334247).

Almost surely, 2^28857685 is an apocalyptic number.

It is an amenable number.

28857685 is a deficient number, since it is larger than the sum of its proper divisors (5816291).

28857685 is an equidigital number, since it uses as much as digits as its factorization.

28857685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7463.

The product of its digits is 1075200, while the sum is 49.

The square root of 28857685 is about 5371.9349400379. The cubic root of 28857685 is about 306.7282872130.

The spelling of 28857685 in words is "twenty-eight million, eight hundred fifty-seven thousand, six hundred eighty-five".