216645250 has 16 divisors (see below), whose sum is σ = 405560376. Its totient is φ = 86658000.

The previous prime is 216645203. The next prime is 216645251. The reversal of 216645250 is 52546612.

216645250 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 137381841 + 79263409 = 11721^2 + 8903^2 .

It is not an unprimeable number, because it can be changed into a prime (216645251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433041 + ... + 433540.

Almost surely, 2^216645250 is an apocalyptic number.

216645250 is a deficient number, since it is larger than the sum of its proper divisors (188915126).

216645250 is an equidigital number, since it uses as much as digits as its factorization.

216645250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866598 (or 866588 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 216645250 is about 14718.8739379071. The cubic root of 216645250 is about 600.5968597709.

The spelling of 216645250 in words is "two hundred sixteen million, six hundred forty-five thousand, two hundred fifty".