28467872989 has 4 divisors (see below), whose sum is σ = 28469199420. Its totient is φ = 28466546560.

The previous prime is 28467872977. The next prime is 28467873011. The reversal of 28467872989 is 98927876482.

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 22911363225 + 5556509764 = 151365^2 + 74542^2 .

It is a cyclic number.

It is not a de Polignac number, because 28467872989 - 2⁷ = 28467872861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28467879989) 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, 630484 + ... + 674125.

It is an arithmetic number, because the mean of its divisors is an integer number (7117299855).

Almost surely, 2^28467872989 is an apocalyptic number.

It is an amenable number.

28467872989 is a deficient number, since it is larger than the sum of its proper divisors (1326431).

28467872989 is a wasteful number, since it uses less digits than its factorization.

28467872989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326430.

The product of its digits is 195084288, while the sum is 70.

The spelling of 28467872989 in words is "twenty-eight billion, four hundred sixty-seven million, eight hundred seventy-two thousand, nine hundred eighty-nine".