28080018 has 18 divisors (see below), whose sum is σ = 60888789. Its totient is φ = 9352512.

The previous prime is 28080007. The next prime is 28080023. The reversal of 28080018 is 81008082.

It can be written as a sum of positive squares in 2 ways, for example, as 27846729 + 233289 = 5277^2 + 483^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3747.

It is a junction number, because it is equal to n+sod(n) for n = 28079973 and 28080000.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21858 + ... + 23106.

Almost surely, 2^28080018 is an apocalyptic number.

28080018 is an abundant number, since it is smaller than the sum of its proper divisors (32808771).

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

28080018 is an equidigital number, since it uses as much as digits as its factorization.

28080018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506 (or 1254 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 28080018 is about 5299.0582182120. The cubic root of 28080018 is about 303.9478860922.

The spelling of 28080018 in words is "twenty-eight million, eighty thousand, eighteen".