28028529 has 24 divisors (see below), whose sum is σ = 44352360. Its totient is φ = 16977408.

The previous prime is 28028527. The next prime is 28028531. The reversal of 28028529 is 92582082.

It is an interprime number because it is at equal distance from previous prime (28028527) and next prime (28028531).

It can be written as a sum of positive squares in 4 ways, for example, as 8208225 + 19820304 = 2865^2 + 4452^2 .

It is not a de Polignac number, because 28028529 - 2¹ = 28028527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28028493 and 28028502.

It is not an unprimeable number, because it can be changed into a prime (28028527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1279 + ... + 7595.

It is an arithmetic number, because the mean of its divisors is an integer number (1848015).

Almost surely, 2^28028529 is an apocalyptic number.

28028529 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28028529 is a deficient number, since it is larger than the sum of its proper divisors (16323831).

28028529 is a wasteful number, since it uses less digits than its factorization.

28028529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369 (or 6366 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28028529 is about 5294.1976729246. The cubic root of 28028529 is about 303.7619941410.

The spelling of 28028529 in words is "twenty-eight million, twenty-eight thousand, five hundred twenty-nine".