216500340 has 48 divisors (see below), whose sum is σ = 692802432. Its totient is φ = 49485696.

The previous prime is 216500279. The next prime is 216500353. The reversal of 216500340 is 43005612.

It is a happy number.

216500340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257319 + ... + 258158.

It is an arithmetic number, because the mean of its divisors is an integer number (14433384).

Almost surely, 2^216500340 is an apocalyptic number.

216500340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216500340 is an abundant number, since it is smaller than the sum of its proper divisors (476302092).

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

216500340 is a wasteful number, since it uses less digits than its factorization.

216500340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515496 (or 515494 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 216500340 is about 14713.9505232279. The cubic root of 216500340 is about 600.4629205269.

Adding to 216500340 its reverse (43005612), we get a palindrome (259505952).

The spelling of 216500340 in words is "two hundred sixteen million, five hundred thousand, three hundred forty".