28030558 has 4 divisors (see below), whose sum is σ = 42045840. Its totient is φ = 14015278.

The previous prime is 28030553. The next prime is 28030591. The reversal of 28030558 is 85503082.

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

It is a super-3 number, since 3×28030558³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28030553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7007638 + ... + 7007641.

It is an arithmetic number, because the mean of its divisors is an integer number (10511460).

Almost surely, 2^28030558 is an apocalyptic number.

28030558 is a deficient number, since it is larger than the sum of its proper divisors (14015282).

28030558 is a wasteful number, since it uses less digits than its factorization.

28030558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14015281.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 28030558 is about 5294.3892943379. The cubic root of 28030558 is about 303.7693237945.

The spelling of 28030558 in words is "twenty-eight million, thirty thousand, five hundred fifty-eight".