216565412 has 24 divisors (see below), whose sum is σ = 437424960. Its totient is φ = 91893600.

The previous prime is 216565399. The next prime is 216565429. The reversal of 216565412 is 214565612.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35462 + ... + 41117.

It is an arithmetic number, because the mean of its divisors is an integer number (18226040).

Almost surely, 2^216565412 is an apocalyptic number.

It is an amenable number.

216565412 is an abundant number, since it is smaller than the sum of its proper divisors (220859548).

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

216565412 is a wasteful number, since it uses less digits than its factorization.

216565412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76691 (or 76689 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 216565412 is about 14716.1615919369. The cubic root of 216565412 is about 600.5230734873.

The spelling of 216565412 in words is "two hundred sixteen million, five hundred sixty-five thousand, four hundred twelve".