8700728 has 8 divisors (see below), whose sum is σ = 16313880. Its totient is φ = 4350360.

The previous prime is 8700721. The next prime is 8700751. The reversal of 8700728 is 8270078.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8700694 and 8700703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8700721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543788 + ... + 543803.

It is an arithmetic number, because the mean of its divisors is an integer number (2039235).

Almost surely, 2^8700728 is an apocalyptic number.

It is an amenable number.

8700728 is a deficient number, since it is larger than the sum of its proper divisors (7613152).

8700728 is a wasteful number, since it uses less digits than its factorization.

8700728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087597 (or 1087593 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 8700728 is about 2949.6996457267. The cubic root of 8700728 is about 205.6767481846.

The spelling of 8700728 in words is "eight million, seven hundred thousand, seven hundred twenty-eight".