216957256 has 32 divisors (see below), whose sum is σ = 418754880. Its totient is φ = 105336000.

The previous prime is 216957227. The next prime is 216957259. The reversal of 216957256 is 652759612.

It is not an unprimeable number, because it can be changed into a prime (216957259) 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, 35206 + ... + 40906.

It is an arithmetic number, because the mean of its divisors is an integer number (13086090).

Almost surely, 2^216957256 is an apocalyptic number.

It is an amenable number.

216957256 is a deficient number, since it is larger than the sum of its proper divisors (201797624).

216957256 is a wasteful number, since it uses less digits than its factorization.

216957256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5845 (or 5841 counting only the distinct ones).

The product of its digits is 226800, while the sum is 43.

The square root of 216957256 is about 14729.4689653090. The cubic root of 216957256 is about 600.8850420073.

The spelling of 216957256 in words is "two hundred sixteen million, nine hundred fifty-seven thousand, two hundred fifty-six".