28028140 has 24 divisors (see below), whose sum is σ = 67267872. Its totient is φ = 9609600.

The previous prime is 28028107. The next prime is 28028141. The reversal of 28028140 is 4182082.

It is not an unprimeable number, because it can be changed into a prime (28028141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99961 + ... + 100240.

It is an arithmetic number, because the mean of its divisors is an integer number (2802828).

Almost surely, 2^28028140 is an apocalyptic number.

28028140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28028140 is an abundant number, since it is smaller than the sum of its proper divisors (39239732).

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

28028140 is a wasteful number, since it uses less digits than its factorization.

28028140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200217 (or 200215 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 28028140 is about 5294.1609344636. The cubic root of 28028140 is about 303.7605888590.

The spelling of 28028140 in words is "twenty-eight million, twenty-eight thousand, one hundred forty".