28115258 has 8 divisors (see below), whose sum is σ = 43201620. Its totient is φ = 13714720.

The previous prime is 28115237. The next prime is 28115261. The reversal of 28115258 is 85251182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25532809 + 2582449 = 5053^2 + 1607^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171353 + ... + 171516.

Almost surely, 2^28115258 is an apocalyptic number.

28115258 is a deficient number, since it is larger than the sum of its proper divisors (15086362).

28115258 is a wasteful number, since it uses less digits than its factorization.

28115258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342912.

The product of its digits is 6400, while the sum is 32.

The square root of 28115258 is about 5302.3822947803. The cubic root of 28115258 is about 304.0749829464.

The spelling of 28115258 in words is "twenty-eight million, one hundred fifteen thousand, two hundred fifty-eight".