28389750009 has 4 divisors (see below), whose sum is σ = 37853000016. Its totient is φ = 18926500004.

The previous prime is 28389749987. The next prime is 28389750031. The reversal of 28389750009 is 90005798382.

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 an interprime number because it is at equal distance from previous prime (28389749987) and next prime (28389750031).

It is a cyclic number.

It is not a de Polignac number, because 28389750009 - 2¹² = 28389745913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28389750209) 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, 4731624999 + ... + 4731625004.

It is an arithmetic number, because the mean of its divisors is an integer number (9463250004).

Almost surely, 2^28389750009 is an apocalyptic number.

It is an amenable number.

28389750009 is a deficient number, since it is larger than the sum of its proper divisors (9463250007).

28389750009 is an equidigital number, since it uses as much as digits as its factorization.

28389750009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9463250006.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 28389750009 in words is "twenty-eight billion, three hundred eighty-nine million, seven hundred fifty thousand, nine".