216434777 has 16 divisors (see below), whose sum is σ = 246489600. Its totient is φ = 188611200.

The previous prime is 216434773. The next prime is 216434789. The reversal of 216434777 is 777434612.

It is a cyclic number.

It is not a de Polignac number, because 216434777 - 2² = 216434773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216434773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9974 + ... + 23072.

It is an arithmetic number, because the mean of its divisors is an integer number (15405600).

Almost surely, 2^216434777 is an apocalyptic number.

It is an amenable number.

216434777 is a deficient number, since it is larger than the sum of its proper divisors (30054823).

216434777 is a wasteful number, since it uses less digits than its factorization.

216434777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13184.

The product of its digits is 197568, while the sum is 41.

The square root of 216434777 is about 14711.7224348477. The cubic root of 216434777 is about 600.4023014919.

The spelling of 216434777 in words is "two hundred sixteen million, four hundred thirty-four thousand, seven hundred seventy-seven".