28135258 has 4 divisors (see below), whose sum is σ = 42202890. Its totient is φ = 14067628.

The previous prime is 28135231. The next prime is 28135277. The reversal of 28135258 is 85253182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26347689 + 1787569 = 5133^2 + 1337^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7033813 + ... + 7033816.

Almost surely, 2^28135258 is an apocalyptic number.

28135258 is a deficient number, since it is larger than the sum of its proper divisors (14067632).

28135258 is a wasteful number, since it uses less digits than its factorization.

28135258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14067631.

The product of its digits is 19200, while the sum is 34.

The square root of 28135258 is about 5304.2679042447. The cubic root of 28135258 is about 304.1470678642.

The spelling of 28135258 in words is "twenty-eight million, one hundred thirty-five thousand, two hundred fifty-eight".