28809645 has 16 divisors (see below), whose sum is σ = 48807360. Its totient is φ = 14461184.

The previous prime is 28809617. The next prime is 28809653. The reversal of 28809645 is 54690882.

It is a cyclic number.

It is not a de Polignac number, because 28809645 - 2¹⁶ = 28744109 is a prime.

It is a super-3 number, since 3×28809645³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28809597 and 28809606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56235 + ... + 56744.

It is an arithmetic number, because the mean of its divisors is an integer number (3050460).

Almost surely, 2^28809645 is an apocalyptic number.

It is an amenable number.

28809645 is a deficient number, since it is larger than the sum of its proper divisors (19997715).

28809645 is a wasteful number, since it uses less digits than its factorization.

28809645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113004.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 28809645 is about 5367.4616905945. The cubic root of 28809645 is about 306.5579869831.

The spelling of 28809645 in words is "twenty-eight million, eight hundred nine thousand, six hundred forty-five".