28891573489 has 4 divisors (see below), whose sum is σ = 30412182640. Its totient is φ = 27370964340.

The previous prime is 28891573421. The next prime is 28891573507. The reversal of 28891573489 is 98437519882.

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 28891573489 - 2¹¹ = 28891571441 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 28891573489.

It is not an unprimeable number, because it can be changed into a prime (28891573189) 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, 760304547 + ... + 760304584.

It is an arithmetic number, because the mean of its divisors is an integer number (7603045660).

Almost surely, 2^28891573489 is an apocalyptic number.

It is an amenable number.

28891573489 is a deficient number, since it is larger than the sum of its proper divisors (1520609151).

28891573489 is a wasteful number, since it uses less digits than its factorization.

28891573489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520609150.

The product of its digits is 34836480, while the sum is 64.

It can be divided in two parts, 288915 and 73489, that added together give a square (362404 = 602²).

The spelling of 28891573489 in words is "twenty-eight billion, eight hundred ninety-one million, five hundred seventy-three thousand, four hundred eighty-nine".