28680540 has 96 divisors (see below), whose sum is σ = 95800320. Its totient is φ = 6268416.

The previous prime is 28680497. The next prime is 28680541. The reversal of 28680540 is 4508682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28680541) 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 31 ways as a sum of consecutive naturals, for example, 8176 + ... + 11144.

It is an arithmetic number, because the mean of its divisors is an integer number (997920).

Almost surely, 2^28680540 is an apocalyptic number.

28680540 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 28680540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47900160).

28680540 is an abundant number, since it is smaller than the sum of its proper divisors (67119780).

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

28680540 is a wasteful number, since it uses less digits than its factorization.

28680540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011 (or 3009 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 28680540 is about 5355.4215520349. The cubic root of 28680540 is about 306.0993739360.

The spelling of 28680540 in words is "twenty-eight million, six hundred eighty thousand, five hundred forty".