8728213 has 4 divisors (see below), whose sum is σ = 9399628. Its totient is φ = 8056800.

The previous prime is 8728211. The next prime is 8728241. The reversal of 8728213 is 3128278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3128278 = 2 ⋅1564139.

It can be written as a sum of positive squares in 2 ways, for example, as 3378244 + 5349969 = 1838^2 + 2313^2 .

It is a cyclic number.

It is not a de Polignac number, because 8728213 - 2¹ = 8728211 is a prime.

It is a Duffinian number.

8728213 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8728211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335688 + ... + 335713.

It is an arithmetic number, because the mean of its divisors is an integer number (2349907).

Almost surely, 2^8728213 is an apocalyptic number.

It is an amenable number.

8728213 is a deficient number, since it is larger than the sum of its proper divisors (671415).

8728213 is a wasteful number, since it uses less digits than its factorization.

8728213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671414.

The product of its digits is 5376, while the sum is 31.

The square root of 8728213 is about 2954.3549211291. The cubic root of 8728213 is about 205.8930934277.

The spelling of 8728213 in words is "eight million, seven hundred twenty-eight thousand, two hundred thirteen".