28667521589 has 6 divisors (see below), whose sum is σ = 33347933334. Its totient is φ = 24572161320.

The previous prime is 28667521513. The next prime is 28667521601. The reversal of 28667521589 is 98512576682.

It can be written as a sum of positive squares in only one way, i.e., 28296959089 + 370562500 = 168217^2 + 19250^2 .

It is not a de Polignac number, because 28667521589 - 2¹⁶ = 28667456053 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28667520589) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 292525682 + ... + 292525779.

It is an arithmetic number, because the mean of its divisors is an integer number (5557988889).

Almost surely, 2^28667521589 is an apocalyptic number.

It is an amenable number.

28667521589 is a deficient number, since it is larger than the sum of its proper divisors (4680411745).

28667521589 is an equidigital number, since it uses as much as digits as its factorization.

28667521589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585051475 (or 585051468 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 59.

The spelling of 28667521589 in words is "twenty-eight billion, six hundred sixty-seven million, five hundred twenty-one thousand, five hundred eighty-nine".