28056140 has 24 divisors (see below), whose sum is σ = 67335072. Its totient is φ = 9619200.

The previous prime is 28056097. The next prime is 28056143. The reversal of 28056140 is 4165082.

It is not an unprimeable number, because it can be changed into a prime (28056143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100061 + ... + 100340.

It is an arithmetic number, because the mean of its divisors is an integer number (2805628).

Almost surely, 2^28056140 is an apocalyptic number.

28056140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28056140 is an abundant number, since it is smaller than the sum of its proper divisors (39278932).

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

28056140 is a wasteful number, since it uses less digits than its factorization.

28056140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200417 (or 200415 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 28056140 is about 5296.8046971736. The cubic root of 28056140 is about 303.8617070662.

The spelling of 28056140 in words is "twenty-eight million, fifty-six thousand, one hundred forty".