216704477 has 16 divisors (see below), whose sum is σ = 249722880. Its totient is φ = 186202800.

The previous prime is 216704461. The next prime is 216704483. The reversal of 216704477 is 774407612.

It is a cyclic number.

It is not a de Polignac number, because 216704477 - 2⁴ = 216704461 is a prime.

It is a super-3 number, since 3×216704477³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216704477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216704417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7274 + ... + 22052.

It is an arithmetic number, because the mean of its divisors is an integer number (15607680).

Almost surely, 2^216704477 is an apocalyptic number.

It is an amenable number.

216704477 is a deficient number, since it is larger than the sum of its proper divisors (33018403).

216704477 is a wasteful number, since it uses less digits than its factorization.

216704477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14864.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 216704477 is about 14720.8857410144. The cubic root of 216704477 is about 600.6515856559.

The spelling of 216704477 in words is "two hundred sixteen million, seven hundred four thousand, four hundred seventy-seven".