28238705 has 8 divisors (see below), whose sum is σ = 36967104. Its totient is φ = 20537200.

The previous prime is 28238701. The next prime is 28238719. The reversal of 28238705 is 50783282.

It is a happy number.

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

It is not a de Polignac number, because 28238705 - 2² = 28238701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28238701) 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, 256661 + ... + 256770.

It is an arithmetic number, because the mean of its divisors is an integer number (4620888).

Almost surely, 2^28238705 is an apocalyptic number.

It is an amenable number.

28238705 is a deficient number, since it is larger than the sum of its proper divisors (8728399).

28238705 is a wasteful number, since it uses less digits than its factorization.

28238705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513447.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28238705 is about 5314.0102559178. The cubic root of 28238705 is about 304.5193720077.

The spelling of 28238705 in words is "twenty-eight million, two hundred thirty-eight thousand, seven hundred five".