8500728 has 32 divisors (see below), whose sum is σ = 21346560. Its totient is φ = 2820960.

The previous prime is 8500711. The next prime is 8500729. The reversal of 8500728 is 8270058.

8500728 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 8500695 and 8500704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8500729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5851 + ... + 7157.

It is an arithmetic number, because the mean of its divisors is an integer number (667080).

Almost surely, 2^8500728 is an apocalyptic number.

It is an amenable number.

8500728 is an abundant number, since it is smaller than the sum of its proper divisors (12845832).

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

8500728 is a wasteful number, since it uses less digits than its factorization.

8500728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587 (or 1583 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 8500728 is about 2915.6007957195. The cubic root of 8500728 is about 204.0885812921.

The spelling of 8500728 in words is "eight million, five hundred thousand, seven hundred twenty-eight".