28841989 has 8 divisors (see below), whose sum is σ = 31502880. Its totient is φ = 26187600.

The previous prime is 28841987. The next prime is 28842001. The reversal of 28841989 is 98914882.

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

It is a cyclic number.

It is not a de Polignac number, because 28841989 - 2¹ = 28841987 is a prime.

It is a super-2 number, since 2×28841989² = 1663720658952242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28841987) 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, 16447 + ... + 18115.

It is an arithmetic number, because the mean of its divisors is an integer number (3937860).

Almost surely, 2^28841989 is an apocalyptic number.

It is an amenable number.

28841989 is a deficient number, since it is larger than the sum of its proper divisors (2660891).

28841989 is a wasteful number, since it uses less digits than its factorization.

28841989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3251.

The product of its digits is 331776, while the sum is 49.

The square root of 28841989 is about 5370.4738152234. The cubic root of 28841989 is about 306.6726662080.

The spelling of 28841989 in words is "twenty-eight million, eight hundred forty-one thousand, nine hundred eighty-nine".