216214788 has 12 divisors (see below), whose sum is σ = 504501200. Its totient is φ = 72071592.

The previous prime is 216214783. The next prime is 216214799. The reversal of 216214788 is 887412612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (216214781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9008938 + ... + 9008961.

Almost surely, 2^216214788 is an apocalyptic number.

It is an amenable number.

216214788 is an abundant number, since it is smaller than the sum of its proper divisors (288286412).

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

216214788 is a wasteful number, since it uses less digits than its factorization.

216214788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18017906 (or 18017904 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 216214788 is about 14704.2438771941. The cubic root of 216214788 is about 600.1988118936.

The spelling of 216214788 in words is "two hundred sixteen million, two hundred fourteen thousand, seven hundred eighty-eight".