28076809 has 8 divisors (see below), whose sum is σ = 29887488. Its totient is φ = 26283840.

The previous prime is 28076801. The next prime is 28076831. The reversal of 28076809 is 90867082.

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 28076809 - 2³ = 28076801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28076801) 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, 1077 + ... + 7570.

It is an arithmetic number, because the mean of its divisors is an integer number (3735936).

Almost surely, 2^28076809 is an apocalyptic number.

It is an amenable number.

28076809 is a deficient number, since it is larger than the sum of its proper divisors (1810679).

28076809 is a wasteful number, since it uses less digits than its factorization.

28076809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8855.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 28076809 is about 5298.7554199076. The cubic root of 28076809 is about 303.9363072068.

The spelling of 28076809 in words is "twenty-eight million, seventy-six thousand, eight hundred nine".