28439568 has 60 divisors (see below), whose sum is σ = 81549468. Its totient is φ = 9246720.

The previous prime is 28439533. The next prime is 28439573. The reversal of 28439568 is 86593482.

28439568 is a `hidden beast` number, since 2 + 84 + 3 + 9 + 568 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1937664 + 26501904 = 1392^2 + 5148^2 .

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 11 ways as a sum of consecutive naturals, for example, 3496 + ... + 8312.

Almost surely, 2^28439568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28439568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40774734).

28439568 is an abundant number, since it is smaller than the sum of its proper divisors (53109900).

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

28439568 is a wasteful number, since it uses less digits than its factorization.

28439568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4872 (or 4863 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 28439568 is about 5332.8761470711. The cubic root of 28439568 is about 305.2396861774.

The spelling of 28439568 in words is "twenty-eight million, four hundred thirty-nine thousand, five hundred sixty-eight".