28530318 has 16 divisors (see below), whose sum is σ = 60417360. Its totient is φ = 8950656.

The previous prime is 28530311. The next prime is 28530331. The reversal of 28530318 is 81303582.

It is a happy number.

It is a super-2 number, since 2×28530318² = 1627958090362248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28530311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139753 + ... + 139956.

It is an arithmetic number, because the mean of its divisors is an integer number (3776085).

Almost surely, 2^28530318 is an apocalyptic number.

28530318 is an abundant number, since it is smaller than the sum of its proper divisors (31887042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28530318 is a wasteful number, since it uses less digits than its factorization.

28530318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279731.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 28530318 is about 5341.3779121122. The cubic root of 28530318 is about 305.5640123622.

It can be divided in two parts, 285 and 30318, that added together give a palindrome (30603).

The spelling of 28530318 in words is "twenty-eight million, five hundred thirty thousand, three hundred eighteen".