28118140 has 24 divisors (see below), whose sum is σ = 59860080. Its totient is φ = 11092608.

The previous prime is 28118137. The next prime is 28118141. The reversal of 28118140 is 4181182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28118141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8170 + ... + 11089.

It is an arithmetic number, because the mean of its divisors is an integer number (2494170).

Almost surely, 2^28118140 is an apocalyptic number.

28118140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28118140 is an abundant number, since it is smaller than the sum of its proper divisors (31741940).

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

28118140 is a wasteful number, since it uses less digits than its factorization.

28118140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19341 (or 19339 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 28118140 is about 5302.6540524534. The cubic root of 28118140 is about 304.0853724907.

The spelling of 28118140 in words is "twenty-eight million, one hundred eighteen thousand, one hundred forty".