8728642 has 16 divisors (see below), whose sum is σ = 14249592. Its totient is φ = 3985920.

The previous prime is 8728627. The next prime is 8728649. The reversal of 8728642 is 2468278.

It can be written as a sum of positive squares in 4 ways, for example, as 4447881 + 4280761 = 2109^2 + 2069^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (8728649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 792 + ... + 4252.

Almost surely, 2^8728642 is an apocalyptic number.

8728642 is a deficient number, since it is larger than the sum of its proper divisors (5520950).

8728642 is a wasteful number, since it uses less digits than its factorization.

8728642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3573.

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

The square root of 8728642 is about 2954.4275249192. The cubic root of 8728642 is about 205.8964666531.

The spelling of 8728642 in words is "eight million, seven hundred twenty-eight thousand, six hundred forty-two".