28044140 has 48 divisors (see below), whose sum is σ = 60662784. Its totient is φ = 10886400.

The previous prime is 28044139. The next prime is 28044151. The reversal of 28044140 is 4144082.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154850 + ... + 155030.

It is an arithmetic number, because the mean of its divisors is an integer number (1263808).

Almost surely, 2^28044140 is an apocalyptic number.

28044140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28044140 is an abundant number, since it is smaller than the sum of its proper divisors (32618644).

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

28044140 is a wasteful number, since it uses less digits than its factorization.

28044140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 28044140 is about 5295.6718176262. The cubic root of 28044140 is about 303.8183789335.

The spelling of 28044140 in words is "twenty-eight million, forty-four thousand, one hundred forty".