28028530 has 8 divisors (see below), whose sum is σ = 50451372. Its totient is φ = 11211408.

The previous prime is 28028527. The next prime is 28028531. The reversal of 28028530 is 3582082.

It can be written as a sum of positive squares in 2 ways, for example, as 26532801 + 1495729 = 5151^2 + 1223^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28028531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1401417 + ... + 1401436.

Almost surely, 2^28028530 is an apocalyptic number.

28028530 is a deficient number, since it is larger than the sum of its proper divisors (22422842).

28028530 is a wasteful number, since it uses less digits than its factorization.

28028530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802860.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 28028530 is about 5294.1977673676. The cubic root of 28028530 is about 303.7619977536.

The spelling of 28028530 in words is "twenty-eight million, twenty-eight thousand, five hundred thirty".