28943860 has 96 divisors (see below), whose sum is σ = 71850240. Its totient is φ = 9676800.

The previous prime is 28943833. The next prime is 28943861. The reversal of 28943860 is 6834982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28943861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 265486 + ... + 265594.

It is an arithmetic number, because the mean of its divisors is an integer number (748440).

Almost surely, 2^28943860 is an apocalyptic number.

28943860 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 28943860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35925120).

28943860 is an abundant number, since it is smaller than the sum of its proper divisors (42906380).

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

28943860 is a wasteful number, since it uses less digits than its factorization.

28943860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 28943860 is about 5379.9498138923. The cubic root of 28943860 is about 307.0333017806.

The spelling of 28943860 in words is "twenty-eight million, nine hundred forty-three thousand, eight hundred sixty".