28529281 has 8 divisors (see below), whose sum is σ = 32953824. Its totient is φ = 24409920.

The previous prime is 28529261. The next prime is 28529309. The reversal of 28529281 is 18292582.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28529281 is a prime.

It is a super-2 number, since 2×28529281² = 1627839748753922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28529281.

It is not an unprimeable number, because it can be changed into a prime (28529251) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 76095 + ... + 76468.

It is an arithmetic number, because the mean of its divisors is an integer number (4119228).

Almost surely, 2^28529281 is an apocalyptic number.

It is an amenable number.

28529281 is a deficient number, since it is larger than the sum of its proper divisors (4424543).

28529281 is a wasteful number, since it uses less digits than its factorization.

28529281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152591.

The product of its digits is 23040, while the sum is 37.

The square root of 28529281 is about 5341.2808389000. The cubic root of 28529281 is about 305.5603101752.

The spelling of 28529281 in words is "twenty-eight million, five hundred twenty-nine thousand, two hundred eighty-one".