28056985 has 8 divisors (see below), whose sum is σ = 36729216. Its totient is φ = 20405040.

The previous prime is 28056961. The next prime is 28057009. The reversal of 28056985 is 58965082.

It is an interprime number because it is at equal distance from previous prime (28056961) and next prime (28057009).

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

It is not a de Polignac number, because 28056985 - 2¹⁷ = 27925913 is a prime.

It is a Duffinian 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, 255009 + ... + 255118.

It is an arithmetic number, because the mean of its divisors is an integer number (4591152).

Almost surely, 2^28056985 is an apocalyptic number.

It is an amenable number.

28056985 is a deficient number, since it is larger than the sum of its proper divisors (8672231).

28056985 is a wasteful number, since it uses less digits than its factorization.

28056985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510143.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 28056985 is about 5296.8844616435. The cubic root of 28056985 is about 303.8647576233.

The spelling of 28056985 in words is "twenty-eight million, fifty-six thousand, nine hundred eighty-five".