28109529 has 48 divisors (see below), whose sum is σ = 49320960. Its totient is φ = 15085440.

The previous prime is 28109509. The next prime is 28109537. The reversal of 28109529 is 92590182.

28109529 is a `hidden beast` number, since 28 + 109 + 529 = 666.

It is not a de Polignac number, because 28109529 - 2¹¹ = 28107481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28109493 and 28109502.

It is not an unprimeable number, because it can be changed into a prime (28109509) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72067 + ... + 72455.

It is an arithmetic number, because the mean of its divisors is an integer number (1027520).

Almost surely, 2^28109529 is an apocalyptic number.

It is an amenable number.

28109529 is a deficient number, since it is larger than the sum of its proper divisors (21211431).

28109529 is a wasteful number, since it uses less digits than its factorization.

28109529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 28109529 is about 5301.8420383863. The cubic root of 28109529 is about 304.0543279232.

The spelling of 28109529 in words is "twenty-eight million, one hundred nine thousand, five hundred twenty-nine".