216730040 has 16 divisors (see below), whose sum is σ = 487642680. Its totient is φ = 86692000.

The previous prime is 216730039. The next prime is 216730061. The reversal of 216730040 is 40037612.

216730040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 216729988 and 216730015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2709086 + ... + 2709165.

Almost surely, 2^216730040 is an apocalyptic number.

216730040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216730040 is an abundant number, since it is smaller than the sum of its proper divisors (270912640).

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

216730040 is a wasteful number, since it uses less digits than its factorization.

216730040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5418262 (or 5418258 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 216730040 is about 14721.7539715891. The cubic root of 216730040 is about 600.6752028465.

Adding to 216730040 its reverse (40037612), we get a palindrome (256767652).

The spelling of 216730040 in words is "two hundred sixteen million, seven hundred thirty thousand, forty".