216322775 has 12 divisors (see below), whose sum is σ = 272639544. Its totient is φ = 170220000.

The previous prime is 216322747. The next prime is 216322823. The reversal of 216322775 is 577223612.

It is not a de Polignac number, because 216322775 - 2²⁴ = 199545559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69401 + ... + 72450.

It is an arithmetic number, because the mean of its divisors is an integer number (22719962).

Almost surely, 2^216322775 is an apocalyptic number.

216322775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

216322775 is a deficient number, since it is larger than the sum of its proper divisors (56316769).

216322775 is a wasteful number, since it uses less digits than its factorization.

216322775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141922 (or 141917 counting only the distinct ones).

The product of its digits is 35280, while the sum is 35.

The square root of 216322775 is about 14707.9153859410. The cubic root of 216322775 is about 600.2987169963.

The spelling of 216322775 in words is "two hundred sixteen million, three hundred twenty-two thousand, seven hundred seventy-five".