281028489 has 8 divisors (see below), whose sum is σ = 428233920. Its totient is φ = 160587696.

The previous prime is 281028481. The next prime is 281028491. The reversal of 281028489 is 984820182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 281028489 - 2³ = 281028481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 281028489.

It is not an unprimeable number, because it can be changed into a prime (281028481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6691134 + ... + 6691175.

It is an arithmetic number, because the mean of its divisors is an integer number (53529240).

Almost surely, 2^281028489 is an apocalyptic number.

It is an amenable number.

281028489 is a deficient number, since it is larger than the sum of its proper divisors (147205431).

281028489 is a wasteful number, since it uses less digits than its factorization.

281028489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13382319.

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 281028489 is about 16763.9043483313. The cubic root of 281028489 is about 655.0132965465.

The spelling of 281028489 in words is "two hundred eighty-one million, twenty-eight thousand, four hundred eighty-nine".