28911204221489 has 4 divisors (see below), whose sum is σ = 29105239149300. Its totient is φ = 28717169293680.

The previous prime is 28911204221453. The next prime is 28911204221533. The reversal of 28911204221489 is 98412240211982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17656299763600 + 11254904457889 = 4201940^2 + 3354833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28911204221489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28911204221489.

It is not an unprimeable number, because it can be changed into a prime (28911204221789) 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, 97017463682 + ... + 97017463979.

It is an arithmetic number, because the mean of its divisors is an integer number (7276309787325).

Almost surely, 2^{28911204221489} is an apocalyptic number.

It is an amenable number.

28911204221489 is a deficient number, since it is larger than the sum of its proper divisors (194034927811).

28911204221489 is a wasteful number, since it uses less digits than its factorization.

28911204221489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194034927810.

The product of its (nonzero) digits is 1327104, while the sum is 53.

The spelling of 28911204221489 in words is "twenty-eight trillion, nine hundred eleven billion, two hundred four million, two hundred twenty-one thousand, four hundred eighty-nine".