28085140 has 12 divisors (see below), whose sum is σ = 58978836. Its totient is φ = 11234048.

The previous prime is 28085119. The next prime is 28085153. The reversal of 28085140 is 4158082.

It can be written as a sum of positive squares in 2 ways, for example, as 21511044 + 6574096 = 4638^2 + 2564^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28085099 and 28085108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702109 + ... + 702148.

It is an arithmetic number, because the mean of its divisors is an integer number (4914903).

Almost surely, 2^28085140 is an apocalyptic number.

28085140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28085140 is an abundant number, since it is smaller than the sum of its proper divisors (30893696).

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

28085140 is a wasteful number, since it uses less digits than its factorization.

28085140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404266 (or 1404264 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 28085140 is about 5299.5414896008. The cubic root of 28085140 is about 303.9663657387.

The spelling of 28085140 in words is "twenty-eight million, eighty-five thousand, one hundred forty".