216722688 has 216 divisors, whose sum is σ = 724213728. Its totient is φ = 57028608.

The previous prime is 216722663. The next prime is 216722699. The reversal of 216722688 is 886227612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 488995 + ... + 489437.

Almost surely, 2^216722688 is an apocalyptic number.

216722688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216722688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362106864).

216722688 is an abundant number, since it is smaller than the sum of its proper divisors (507491040).

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

216722688 is a wasteful number, since it uses less digits than its factorization.

216722688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 468 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 216722688 is about 14721.5042709636. The cubic root of 216722688 is about 600.6684106577.

The spelling of 216722688 in words is "two hundred sixteen million, seven hundred twenty-two thousand, six hundred eighty-eight".