28745258 has 4 divisors (see below), whose sum is σ = 43117890. Its totient is φ = 14372628.

The previous prime is 28745257. The next prime is 28745261. The reversal of 28745258 is 85254782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85254782 = 2 ⋅42627391.

It can be written as a sum of positive squares in only one way, i.e., 24970009 + 3775249 = 4997^2 + 1943^2 .

It is not an unprimeable number, because it can be changed into a prime (28745257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7186313 + ... + 7186316.

Almost surely, 2^28745258 is an apocalyptic number.

28745258 is a deficient number, since it is larger than the sum of its proper divisors (14372632).

28745258 is a wasteful number, since it uses less digits than its factorization.

28745258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14372631.

The product of its digits is 179200, while the sum is 41.

The square root of 28745258 is about 5361.4604353665. The cubic root of 28745258 is about 306.3294400054.

The spelling of 28745258 in words is "twenty-eight million, seven hundred forty-five thousand, two hundred fifty-eight".