28543009 has 8 divisors (see below), whose sum is σ = 31414752. Its totient is φ = 25717440.

The previous prime is 28543001. The next prime is 28543019. The reversal of 28543009 is 90034582.

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

It is a cyclic number.

It is not a de Polignac number, because 28543009 - 2³ = 28543001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28543001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10239 + ... + 12724.

It is an arithmetic number, because the mean of its divisors is an integer number (3926844).

Almost surely, 2^28543009 is an apocalyptic number.

It is an amenable number.

28543009 is a deficient number, since it is larger than the sum of its proper divisors (2871743).

28543009 is a wasteful number, since it uses less digits than its factorization.

28543009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23087.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28543009 is about 5342.5657693659. The cubic root of 28543009 is about 305.6093131545.

The spelling of 28543009 in words is "twenty-eight million, five hundred forty-three thousand, nine".