28244140 has 24 divisors (see below), whose sum is σ = 62802432. Its totient is φ = 10632960.

The previous prime is 28244137. The next prime is 28244141. The reversal of 28244140 is 4144282.

It is not an unprimeable number, because it can be changed into a prime (28244141) 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, 41196 + ... + 41875.

It is an arithmetic number, because the mean of its divisors is an integer number (2616768).

Almost surely, 2^28244140 is an apocalyptic number.

28244140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28244140 is an abundant number, since it is smaller than the sum of its proper divisors (34558292).

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

28244140 is a wasteful number, since it uses less digits than its factorization.

28244140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83097 (or 83095 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 28244140 is about 5314.5216153479. The cubic root of 28244140 is about 304.5389073300.

The spelling of 28244140 in words is "twenty-eight million, two hundred forty-four thousand, one hundred forty".