216823656 has 64 divisors (see below), whose sum is σ = 620599680. Its totient is φ = 61839360.

The previous prime is 216823631. The next prime is 216823657. The reversal of 216823656 is 656328612.

It is not an unprimeable number, because it can be changed into a prime (216823657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163476 + ... + 164796.

It is an arithmetic number, because the mean of its divisors is an integer number (9696870).

Almost surely, 2^216823656 is an apocalyptic number.

It is an amenable number.

216823656 is an abundant number, since it is smaller than the sum of its proper divisors (403776024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216823656 is a wasteful number, since it uses less digits than its factorization.

216823656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314 (or 2310 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 216823656 is about 14724.9331407650. The cubic root of 216823656 is about 600.7616771152.

The spelling of 216823656 in words is "two hundred sixteen million, eight hundred twenty-three thousand, six hundred fifty-six".