28109653 has 32 divisors (see below), whose sum is σ = 36191232. Its totient is φ = 21427200.

The previous prime is 28109651. The next prime is 28109747. The reversal of 28109653 is 35690182.

It is not a de Polignac number, because 28109653 - 2¹ = 28109651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28109651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75175 + ... + 75547.

It is an arithmetic number, because the mean of its divisors is an integer number (1130976).

Almost surely, 2^28109653 is an apocalyptic number.

It is an amenable number.

28109653 is a deficient number, since it is larger than the sum of its proper divisors (8081579).

28109653 is a wasteful number, since it uses less digits than its factorization.

28109653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 28109653 is about 5301.8537324223. The cubic root of 28109653 is about 304.0547750157.

The spelling of 28109653 in words is "twenty-eight million, one hundred nine thousand, six hundred fifty-three".