216678793 has 8 divisors (see below), whose sum is σ = 228648800. Its totient is φ = 204765408.

The previous prime is 216678779. The next prime is 216678799. The reversal of 216678793 is 397876612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216678793 - 2⁹ = 216678281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216678799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6171 + ... + 21712.

It is an arithmetic number, because the mean of its divisors is an integer number (28581100).

Almost surely, 2^216678793 is an apocalyptic number.

It is an amenable number.

216678793 is a deficient number, since it is larger than the sum of its proper divisors (11970007).

216678793 is a wasteful number, since it uses less digits than its factorization.

216678793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28311.

The product of its digits is 762048, while the sum is 49.

The square root of 216678793 is about 14720.0133491787. The cubic root of 216678793 is about 600.6278548051.

The spelling of 216678793 in words is "two hundred sixteen million, six hundred seventy-eight thousand, seven hundred ninety-three".