8780728 has 48 divisors (see below), whose sum is σ = 18577440. Its totient is φ = 3886080.

The previous prime is 8780711. The next prime is 8780743. The reversal of 8780728 is 8270878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45400 + ... + 45592.

It is an arithmetic number, because the mean of its divisors is an integer number (387030).

Almost surely, 2^8780728 is an apocalyptic number.

8780728 is a gapful number since it is divisible by the number (88) 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 8780728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9288720).

8780728 is an abundant number, since it is smaller than the sum of its proper divisors (9796712).

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

8780728 is a wasteful number, since it uses less digits than its factorization.

8780728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 8780728 is about 2963.2293195094. The cubic root of 8780728 is about 206.3052000399.

The spelling of 8780728 in words is "eight million, seven hundred eighty thousand, seven hundred twenty-eight".