216568929 has 8 divisors (see below), whose sum is σ = 295801632. Its totient is φ = 140857760.

The previous prime is 216568889. The next prime is 216568981. The reversal of 216568929 is 929865612.

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 216568929 - 2¹⁷ = 216437857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216558929) 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, 880239 + ... + 880484.

It is an arithmetic number, because the mean of its divisors is an integer number (36975204).

Almost surely, 2^216568929 is an apocalyptic number.

It is an amenable number.

216568929 is a deficient number, since it is larger than the sum of its proper divisors (79232703).

216568929 is a wasteful number, since it uses less digits than its factorization.

216568929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760767.

The product of its digits is 466560, while the sum is 48.

The square root of 216568929 is about 14716.2810859266. The cubic root of 216568929 is about 600.5263242807.

The spelling of 216568929 in words is "two hundred sixteen million, five hundred sixty-eight thousand, nine hundred twenty-nine".