28818009 has 24 divisors (see below), whose sum is σ = 48084192. Its totient is φ = 16437120.

The previous prime is 28817993. The next prime is 28818017. The reversal of 28818009 is 90081882.

It is not a de Polignac number, because 28818009 - 2⁴ = 28817993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28818029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6879 + ... + 10244.

It is an arithmetic number, because the mean of its divisors is an integer number (2003508).

Almost surely, 2^28818009 is an apocalyptic number.

It is an amenable number.

28818009 is a deficient number, since it is larger than the sum of its proper divisors (19266183).

28818009 is a wasteful number, since it uses less digits than its factorization.

28818009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17157 (or 17154 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 28818009 is about 5368.2407732888. The cubic root of 28818009 is about 306.5876506937.

The spelling of 28818009 in words is "twenty-eight million, eight hundred eighteen thousand, nine".