28971489 has 4 divisors (see below), whose sum is σ = 38628656. Its totient is φ = 19314324.

The previous prime is 28971487. The next prime is 28971497. The reversal of 28971489 is 98417982.

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 not a de Polignac number, because 28971489 - 2¹ = 28971487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28971487) 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, 4828579 + ... + 4828584.

It is an arithmetic number, because the mean of its divisors is an integer number (9657164).

Almost surely, 2^28971489 is an apocalyptic number.

It is an amenable number.

28971489 is a deficient number, since it is larger than the sum of its proper divisors (9657167).

28971489 is an equidigital number, since it uses as much as digits as its factorization.

28971489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9657166.

The product of its digits is 290304, while the sum is 48.

The square root of 28971489 is about 5382.5169762854. The cubic root of 28971489 is about 307.1309658483.

The spelling of 28971489 in words is "twenty-eight million, nine hundred seventy-one thousand, four hundred eighty-nine".