28028258 has 4 divisors (see below), whose sum is σ = 42042390. Its totient is φ = 14014128.

The previous prime is 28028251. The next prime is 28028281. The reversal of 28028258 is 85282082.

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., 27804529 + 223729 = 5273^2 + 473^2 .

It is not an unprimeable number, because it can be changed into a prime (28028251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7007063 + ... + 7007066.

Almost surely, 2^28028258 is an apocalyptic number.

28028258 is a deficient number, since it is larger than the sum of its proper divisors (14014132).

28028258 is a wasteful number, since it uses less digits than its factorization.

28028258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14014131.

The product of its (nonzero) digits is 20480, while the sum is 35.

The square root of 28028258 is about 5294.1720788051. The cubic root of 28028258 is about 303.7610151413.

The spelling of 28028258 in words is "twenty-eight million, twenty-eight thousand, two hundred fifty-eight".