8642728 has 8 divisors (see below), whose sum is σ = 16205130. Its totient is φ = 4321360.

The previous prime is 8642723. The next prime is 8642747. The reversal of 8642728 is 8272468.

It can be written as a sum of positive squares in only one way, i.e., 7717284 + 925444 = 2778^2 + 962^2 .

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

It is not an unprimeable number, because it can be changed into a prime (8642723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540163 + ... + 540178.

Almost surely, 2^8642728 is an apocalyptic number.

It is an amenable number.

8642728 is a deficient number, since it is larger than the sum of its proper divisors (7562402).

8642728 is a wasteful number, since it uses less digits than its factorization.

8642728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080347 (or 1080343 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 8642728 is about 2939.8516969398. The cubic root of 8642728 is about 205.2187076915.

The spelling of 8642728 in words is "eight million, six hundred forty-two thousand, seven hundred twenty-eight".