28242489 has 20 divisors (see below), whose sum is σ = 41486480. Its totient is φ = 17090040.

The previous prime is 28242479. The next prime is 28242499. The reversal of 28242489 is 98424282.

It is an interprime number because it is at equal distance from previous prime (28242479) and next prime (28242499).

It is not a de Polignac number, because 28242489 - 2¹² = 28238393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28242449) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 43602 + ... + 44244.

It is an arithmetic number, because the mean of its divisors is an integer number (2074324).

Almost surely, 2^28242489 is an apocalyptic number.

It is an amenable number.

28242489 is a deficient number, since it is larger than the sum of its proper divisors (13243991).

28242489 is an frugal number, since it uses more digits than its factorization.

28242489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690 (or 657 counting only the distinct ones).

The product of its digits is 73728, while the sum is 39.

The square root of 28242489 is about 5314.3662839515. The cubic root of 28242489 is about 304.5329733141.

The spelling of 28242489 in words is "twenty-eight million, two hundred forty-two thousand, four hundred eighty-nine".