28018040 has 32 divisors (see below), whose sum is σ = 66750480. Its totient is φ = 10547712.

The previous prime is 28018021. The next prime is 28018043. The reversal of 28018040 is 4081082.

It is a junction number, because it is equal to n+sod(n) for n = 28017997 and 28018015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28018043) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 19922 + ... + 21281.

Almost surely, 2^28018040 is an apocalyptic number.

28018040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28018040 is an abundant number, since it is smaller than the sum of its proper divisors (38732440).

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

28018040 is a wasteful number, since it uses less digits than its factorization.

28018040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41231 (or 41227 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 28018040 is about 5293.2069674253. The cubic root of 28018040 is about 303.7240975502.

The spelling of 28018040 in words is "twenty-eight million, eighteen thousand, forty".