28258018 has 4 divisors (see below), whose sum is σ = 42387030. Its totient is φ = 14129008.

The previous prime is 28258001. The next prime is 28258033. The reversal of 28258018 is 81085282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81085282 = 2 ⋅40542641.

It can be written as a sum of positive squares in only one way, i.e., 28058209 + 199809 = 5297^2 + 447^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7064503 + ... + 7064506.

Almost surely, 2^28258018 is an apocalyptic number.

28258018 is a deficient number, since it is larger than the sum of its proper divisors (14129012).

28258018 is a wasteful number, since it uses less digits than its factorization.

28258018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14129011.

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 28258018 is about 5315.8271228474. The cubic root of 28258018 is about 304.5887784292.

The spelling of 28258018 in words is "twenty-eight million, two hundred fifty-eight thousand, eighteen".