28829009 has 4 divisors (see below), whose sum is σ = 31449840. Its totient is φ = 26208180.

The previous prime is 28828997. The next prime is 28829011. The reversal of 28829009 is 90092882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28829009 is a prime.

It is a super-2 number, since 2×28829009² = 1662223519844162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28829029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1310399 + ... + 1310420.

It is an arithmetic number, because the mean of its divisors is an integer number (7862460).

Almost surely, 2^28829009 is an apocalyptic number.

It is an amenable number.

28829009 is a deficient number, since it is larger than the sum of its proper divisors (2620831).

28829009 is a wasteful number, since it uses less digits than its factorization.

28829009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620830.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 28829009 is about 5369.2652197484. The cubic root of 28829009 is about 306.6266544888.

The spelling of 28829009 in words is "twenty-eight million, eight hundred twenty-nine thousand, nine".