213816728 has 16 divisors (see below), whose sum is σ = 422007000. Its totient is φ = 101281536.

The previous prime is 213816661. The next prime is 213816731. The reversal of 213816728 is 827618312.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 213816691 and 213816700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703193 + ... + 703496.

Almost surely, 2^213816728 is an apocalyptic number.

It is an amenable number.

213816728 is a deficient number, since it is larger than the sum of its proper divisors (208190272).

213816728 is a wasteful number, since it uses less digits than its factorization.

213816728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406714 (or 1406710 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 213816728 is about 14622.4733885892. The cubic root of 213816728 is about 597.9716022502.

The spelling of 213816728 in words is "two hundred thirteen million, eight hundred sixteen thousand, seven hundred twenty-eight".