28051009 has 8 divisors (see below), whose sum is σ = 32094720. Its totient is φ = 24016416.

The previous prime is 28050991. The next prime is 28051031. The reversal of 28051009 is 90015082.

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 28051009 - 2⁷ = 28050881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28051409) 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, 6672 + ... + 10030.

It is an arithmetic number, because the mean of its divisors is an integer number (4011840).

Almost surely, 2^28051009 is an apocalyptic number.

It is an amenable number.

28051009 is a deficient number, since it is larger than the sum of its proper divisors (4043711).

28051009 is a wasteful number, since it uses less digits than its factorization.

28051009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4559.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 28051009 is about 5296.3203264153. The cubic root of 28051009 is about 303.8431821911.

The spelling of 28051009 in words is "twenty-eight million, fifty-one thousand, nine".