216349679 has 16 divisors (see below), whose sum is σ = 266763840. Its totient is φ = 170864640.

The previous prime is 216349649. The next prime is 216349697. The reversal of 216349679 is 976943612.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216349679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216349649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56477 + ... + 60185.

It is an arithmetic number, because the mean of its divisors is an integer number (16672740).

Almost surely, 2^216349679 is an apocalyptic number.

216349679 is a deficient number, since it is larger than the sum of its proper divisors (50414161).

216349679 is a wasteful number, since it uses less digits than its factorization.

216349679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4370.

The product of its digits is 489888, while the sum is 47.

The square root of 216349679 is about 14708.8299670640. The cubic root of 216349679 is about 600.3236022897.

It can be divided in two parts, 21634 and 9679, that added together give a palindrome (31313).

The spelling of 216349679 in words is "two hundred sixteen million, three hundred forty-nine thousand, six hundred seventy-nine".