28147685 has 8 divisors (see below), whose sum is σ = 33807480. Its totient is φ = 22497984.

The previous prime is 28147667. The next prime is 28147703. The reversal of 28147685 is 58674182.

It is an interprime number because it is at equal distance from previous prime (28147667) and next prime (28147703).

It can be written as a sum of positive squares in 4 ways, for example, as 11115556 + 17032129 = 3334^2 + 4127^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28147685 - 2¹⁰ = 28146661 is a prime.

It is a congruent 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, 6659 + ... + 10031.

It is an arithmetic number, because the mean of its divisors is an integer number (4225935).

Almost surely, 2^28147685 is an apocalyptic number.

It is an amenable number.

28147685 is a deficient number, since it is larger than the sum of its proper divisors (5659795).

28147685 is a wasteful number, since it uses less digits than its factorization.

28147685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5047.

The product of its digits is 107520, while the sum is 41.

The square root of 28147685 is about 5305.4391901142. The cubic root of 28147685 is about 304.1918406220.

The spelling of 28147685 in words is "twenty-eight million, one hundred forty-seven thousand, six hundred eighty-five".