28807258 has 4 divisors (see below), whose sum is σ = 43210890. Its totient is φ = 14403628.

The previous prime is 28807243. The next prime is 28807279. The reversal of 28807258 is 85270882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85270882 = 2 ⋅42635441.

It can be written as a sum of positive squares in only one way, i.e., 17497489 + 11309769 = 4183^2 + 3363^2 .

It is a super-2 number, since 2×28807258² = 1659716226957128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28807258.

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, 7201813 + ... + 7201816.

Almost surely, 2^28807258 is an apocalyptic number.

28807258 is a deficient number, since it is larger than the sum of its proper divisors (14403632).

28807258 is a wasteful number, since it uses less digits than its factorization.

28807258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14403631.

The product of its (nonzero) digits is 71680, while the sum is 40.

The square root of 28807258 is about 5367.2393276246. The cubic root of 28807258 is about 306.5495202107.

The spelling of 28807258 in words is "twenty-eight million, eight hundred seven thousand, two hundred fifty-eight".