28238507 has 8 divisors (see below), whose sum is σ = 30853872. Its totient is φ = 25631200.

The previous prime is 28238447. The next prime is 28238519. The reversal of 28238507 is 70583282.

It is a happy number.

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 28238507 - 2⁸ = 28238251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28238527) 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, 7157 + ... + 10377.

It is an arithmetic number, because the mean of its divisors is an integer number (3856734).

Almost surely, 2^28238507 is an apocalyptic number.

28238507 is a deficient number, since it is larger than the sum of its proper divisors (2615365).

28238507 is a wasteful number, since it uses less digits than its factorization.

28238507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4029.

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

The square root of 28238507 is about 5313.9916258873. The cubic root of 28238507 is about 304.5186602779.

The spelling of 28238507 in words is "twenty-eight million, two hundred thirty-eight thousand, five hundred seven".