216769745 has 8 divisors (see below), whose sum is σ = 263787840. Its totient is φ = 170973040.

The previous prime is 216769741. The next prime is 216769769. The reversal of 216769745 is 547967612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216769745 - 2² = 216769741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216769745.

It is not an unprimeable number, because it can be changed into a prime (216769741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304955 + ... + 305664.

It is an arithmetic number, because the mean of its divisors is an integer number (32973480).

Almost surely, 2^216769745 is an apocalyptic number.

It is an amenable number.

216769745 is a deficient number, since it is larger than the sum of its proper divisors (47018095).

216769745 is an equidigital number, since it uses as much as digits as its factorization.

216769745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610695.

The product of its digits is 635040, while the sum is 47.

The square root of 216769745 is about 14723.1024244213. The cubic root of 216769745 is about 600.7118818914.

The spelling of 216769745 in words is "two hundred sixteen million, seven hundred sixty-nine thousand, seven hundred forty-five".