216441645 has 32 divisors (see below), whose sum is σ = 409432320. Its totient is φ = 95531520.

The previous prime is 216441623. The next prime is 216441647. The reversal of 216441645 is 546144612.

It is not a de Polignac number, because 216441645 - 2⁶ = 216441581 is a prime.

It is a super-3 number, since 3×216441645³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216441647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32496 + ... + 38585.

It is an arithmetic number, because the mean of its divisors is an integer number (12794760).

Almost surely, 2^216441645 is an apocalyptic number.

It is an amenable number.

216441645 is a deficient number, since it is larger than the sum of its proper divisors (192990675).

216441645 is a wasteful number, since it uses less digits than its factorization.

216441645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71125.

The product of its digits is 23040, while the sum is 33.

The square root of 216441645 is about 14711.9558522992. The cubic root of 216441645 is about 600.4086521647.

The spelling of 216441645 in words is "two hundred sixteen million, four hundred forty-one thousand, six hundred forty-five".