228750009 has 4 divisors (see below), whose sum is σ = 305000016. Its totient is φ = 152500004.

The previous prime is 228749971. The next prime is 228750043. The reversal of 228750009 is 900057822.

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 not a de Polignac number, because 228750009 - 2¹⁷ = 228618937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228750059) 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, 38124999 + ... + 38125004.

It is an arithmetic number, because the mean of its divisors is an integer number (76250004).

Almost surely, 2^228750009 is an apocalyptic number.

It is an amenable number.

228750009 is a deficient number, since it is larger than the sum of its proper divisors (76250007).

228750009 is an equidigital number, since it uses as much as digits as its factorization.

228750009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76250006.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 228750009 is about 15124.4837597850. The cubic root of 228750009 is about 611.5806083673.

The spelling of 228750009 in words is "two hundred twenty-eight million, seven hundred fifty thousand, nine".