28028680 has 16 divisors (see below), whose sum is σ = 63064620. Its totient is φ = 11211456.

The previous prime is 28028659. The next prime is 28028701. The reversal of 28028680 is 8682082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28028659) and next prime (28028701).

It can be written as a sum of positive squares in 2 ways, for example, as 27857284 + 171396 = 5278^2 + 414^2 .

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 3 ways as a sum of consecutive naturals, for example, 350319 + ... + 350398.

Almost surely, 2^28028680 is an apocalyptic number.

28028680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28028680 is an abundant number, since it is smaller than the sum of its proper divisors (35035940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28028680 is a wasteful number, since it uses less digits than its factorization.

28028680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700728 (or 700724 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 28028680 is about 5294.2119338009. The cubic root of 28028680 is about 303.7625396326.

The spelling of 28028680 in words is "twenty-eight million, twenty-eight thousand, six hundred eighty".