2028689 has 8 divisors (see below), whose sum is σ = 2205672. Its totient is φ = 1854720.

The previous prime is 2028679. The next prime is 2028701. The reversal of 2028689 is 9868202.

It can be written as a sum of positive squares in 4 ways, for example, as 46225 + 1982464 = 215^2 + 1408^2 .

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 2028689 - 2¹⁶ = 1963153 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2028629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 779 + ... + 2159.

It is an arithmetic number, because the mean of its divisors is an integer number (275709).

2^2028689 is an apocalyptic number.

It is an amenable number.

2028689 is a deficient number, since it is larger than the sum of its proper divisors (176983).

2028689 is a wasteful number, since it uses less digits than its factorization.

2028689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 2028689 is about 1424.3205397662. The cubic root of 2028689 is about 126.5916784526.

The spelling of 2028689 in words is "two million, twenty-eight thousand, six hundred eighty-nine".