28009258 has 4 divisors (see below), whose sum is σ = 42013890. Its totient is φ = 14004628.

The previous prime is 28009231. The next prime is 28009291. The reversal of 28009258 is 85290082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85290082 = 2 ⋅42645041.

It can be written as a sum of positive squares in only one way, i.e., 21316689 + 6692569 = 4617^2 + 2587^2 .

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, 7002313 + ... + 7002316.

Almost surely, 2^28009258 is an apocalyptic number.

28009258 is a deficient number, since it is larger than the sum of its proper divisors (14004632).

28009258 is a wasteful number, since it uses less digits than its factorization.

28009258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14004631.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 28009258 is about 5292.3773486024. The cubic root of 28009258 is about 303.6923610481.

The spelling of 28009258 in words is "twenty-eight million, nine thousand, two hundred fifty-eight".