28121701489 has 4 divisors (see below), whose sum is σ = 32139087424. Its totient is φ = 24104315556.

The previous prime is 28121701483. The next prime is 28121701493. The reversal of 28121701489 is 98410712182.

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 28121701489 - 2³ = 28121701481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28121701481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2008692957 + ... + 2008692970.

It is an arithmetic number, because the mean of its divisors is an integer number (8034771856).

Almost surely, 2^28121701489 is an apocalyptic number.

It is an amenable number.

28121701489 is a deficient number, since it is larger than the sum of its proper divisors (4017385935).

28121701489 is an equidigital number, since it uses as much as digits as its factorization.

28121701489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4017385934.

The product of its (nonzero) digits is 64512, while the sum is 43.

The spelling of 28121701489 in words is "twenty-eight billion, one hundred twenty-one million, seven hundred one thousand, four hundred eighty-nine".