28890002 has 4 divisors (see below), whose sum is σ = 43335006. Its totient is φ = 14445000.

The previous prime is 28889989. The next prime is 28890031. The reversal of 28890002 is 20009882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20009882 = 2 ⋅10004941.

It can be written as a sum of positive squares in only one way, i.e., 24098281 + 4791721 = 4909^2 + 2189^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7222499 + ... + 7222502.

Almost surely, 2^28890002 is an apocalyptic number.

28890002 is a deficient number, since it is larger than the sum of its proper divisors (14445004).

28890002 is a wasteful number, since it uses less digits than its factorization.

28890002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14445003.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 28890002 is about 5374.9420461992. The cubic root of 28890002 is about 306.8427436116.

Adding to 28890002 its reverse (20009882), we get a palindrome (48899884).

The spelling of 28890002 in words is "twenty-eight million, eight hundred ninety thousand, two".