216305670 has 32 divisors (see below), whose sum is σ = 593296128. Its totient is φ = 49441248.

The previous prime is 216305669. The next prime is 216305707. The reversal of 216305670 is 76503612.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 514804 + ... + 515223.

It is an arithmetic number, because the mean of its divisors is an integer number (18540504).

Almost surely, 2^216305670 is an apocalyptic number.

216305670 is an abundant number, since it is smaller than the sum of its proper divisors (376990458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216305670 is a wasteful number, since it uses less digits than its factorization.

216305670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030044.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 216305670 is about 14707.3338848345. Note that the first 3 decimals coincide. The cubic root of 216305670 is about 600.2828943748.

The spelling of 216305670 in words is "two hundred sixteen million, three hundred five thousand, six hundred seventy".