28000140 has 96 divisors (see below), whose sum is σ = 90370560. Its totient is φ = 6345216.

The previous prime is 28000123. The next prime is 28000151. The reversal of 28000140 is 4100082.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68256 + ... + 68664.

It is an arithmetic number, because the mean of its divisors is an integer number (941360).

Almost surely, 2^28000140 is an apocalyptic number.

28000140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28000140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45185280).

28000140 is an abundant number, since it is smaller than the sum of its proper divisors (62370420).

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

28000140 is a wasteful number, since it uses less digits than its factorization.

28000140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 28000140 is about 5291.5158508692. The cubic root of 28000140 is about 303.6594032849.

The spelling of 28000140 in words is "twenty-eight million, one hundred forty", and thus it is an aban number.