28242018 has 96 divisors (see below), whose sum is σ = 75479040. Its totient is φ = 7452000.

The previous prime is 28242007. The next prime is 28242047. The reversal of 28242018 is 81024282.

It is a super-2 number, since 2×28242018² = 1595223161424648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28241982 and 28242000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112393 + ... + 112643.

It is an arithmetic number, because the mean of its divisors is an integer number (786240).

Almost surely, 2^28242018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28242018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37739520).

28242018 is an abundant number, since it is smaller than the sum of its proper divisors (47237022).

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

28242018 is a wasteful number, since it uses less digits than its factorization.

28242018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28242018 is about 5314.3219699224. The cubic root of 28242018 is about 304.5312804058.

The spelling of 28242018 in words is "twenty-eight million, two hundred forty-two thousand, eighteen".