216956464 has 10 divisors (see below), whose sum is σ = 420353180. Its totient is φ = 108478224.

The previous prime is 216956449. The next prime is 216956471. The reversal of 216956464 is 464659612.

216956464 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 216956464.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6779874 + ... + 6779905.

It is an arithmetic number, because the mean of its divisors is an integer number (42035318).

Almost surely, 2^216956464 is an apocalyptic number.

It is an amenable number.

216956464 is a deficient number, since it is larger than the sum of its proper divisors (203396716).

216956464 is a wasteful number, since it uses less digits than its factorization.

216956464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13559787 (or 13559781 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The square root of 216956464 is about 14729.4420804048. The cubic root of 216956464 is about 600.8843108318.

The spelling of 216956464 in words is "two hundred sixteen million, nine hundred fifty-six thousand, four hundred sixty-four".