28861328 has 20 divisors (see below), whose sum is σ = 56170140. Its totient is φ = 14365824.

The previous prime is 28861319. The next prime is 28861331. The reversal of 28861328 is 82316882.

It can be written as a sum of positive squares in 2 ways, for example, as 16386304 + 12475024 = 4048^2 + 3532^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28861291 and 28861300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275 + ... + 7602.

It is an arithmetic number, because the mean of its divisors is an integer number (2808507).

Almost surely, 2^28861328 is an apocalyptic number.

It is an amenable number.

28861328 is a deficient number, since it is larger than the sum of its proper divisors (27308812).

28861328 is a wasteful number, since it uses less digits than its factorization.

28861328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8114 (or 8108 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 28861328 is about 5372.2740064148. The cubic root of 28861328 is about 306.7411938170.

It can be divided in two parts, 288 and 61328, that added together give a palindrome (61616).

The spelling of 28861328 in words is "twenty-eight million, eight hundred sixty-one thousand, three hundred twenty-eight".