28000018 has 8 divisors (see below), whose sum is σ = 42022512. Its totient is φ = 13992516.

The previous prime is 27999943. The next prime is 28000019. The reversal of 28000018 is 81000082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 27999959 and 28000004.

It is not an unprimeable number, because it can be changed into a prime (28000019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5121 + ... + 9067.

It is an arithmetic number, because the mean of its divisors is an integer number (5252814).

Almost surely, 2^28000018 is an apocalyptic number.

28000018 is a deficient number, since it is larger than the sum of its proper divisors (14022494).

28000018 is a wasteful number, since it uses less digits than its factorization.

28000018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7496.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 28000018 is about 5291.5043229690. The cubic root of 28000018 is about 303.6589622573.

The spelling of 28000018 in words is "twenty-eight million, eighteen", and thus it is an aban number and an uban number.