28930489 has 4 divisors (see below), whose sum is σ = 33063424. Its totient is φ = 24797556.

The previous prime is 28930477. The next prime is 28930493. The reversal of 28930489 is 98403982.

It is a happy number.

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 28930489 - 2⁵ = 28930457 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (28930289) 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, 2066457 + ... + 2066470.

It is an arithmetic number, because the mean of its divisors is an integer number (8265856).

Almost surely, 2^28930489 is an apocalyptic number.

It is an amenable number.

28930489 is a deficient number, since it is larger than the sum of its proper divisors (4132935).

28930489 is an equidigital number, since it uses as much as digits as its factorization.

28930489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4132934.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 28930489 is about 5378.7070007577. The cubic root of 28930489 is about 306.9860151297.

The spelling of 28930489 in words is "twenty-eight million, nine hundred thirty thousand, four hundred eighty-nine".