28890001 has 8 divisors (see below), whose sum is σ = 34452864. Its totient is φ = 23686080.

The previous prime is 28889989. The next prime is 28890031. The reversal of 28890001 is 10009882.

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 28890001 - 2¹⁷ = 28758929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28890031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89560 + ... + 89881.

It is an arithmetic number, because the mean of its divisors is an integer number (4306608).

Almost surely, 2^28890001 is an apocalyptic number.

It is an amenable number.

28890001 is a deficient number, since it is larger than the sum of its proper divisors (5562863).

28890001 is a wasteful number, since it uses less digits than its factorization.

28890001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179471.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 28890001 is about 5374.9419531749. The cubic root of 28890001 is about 306.8427400713.

Adding to 28890001 its reverse (10009882), we get a palindrome (38899883).

The spelling of 28890001 in words is "twenty-eight million, eight hundred ninety thousand, one".