216350729 has 24 divisors (see below), whose sum is σ = 264078720. Its totient is φ = 176522976.

The previous prime is 216350711. The next prime is 216350737. The reversal of 216350729 is 927053612.

It is a de Polignac number, because none of the positive numbers 2^k-216350729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216350429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83942 + ... + 86480.

It is an arithmetic number, because the mean of its divisors is an integer number (11003280).

Almost surely, 2^216350729 is an apocalyptic number.

It is an amenable number.

216350729 is a deficient number, since it is larger than the sum of its proper divisors (47727991).

216350729 is a wasteful number, since it uses less digits than its factorization.

216350729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637 (or 2630 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 216350729 is about 14708.8656598665. The cubic root of 216350729 is about 600.3245734625.

The spelling of 216350729 in words is "two hundred sixteen million, three hundred fifty thousand, seven hundred twenty-nine".