216144660 has 48 divisors (see below), whose sum is σ = 619286976. Its totient is φ = 56297472.

The previous prime is 216144659. The next prime is 216144667. The reversal of 216144660 is 66441612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216144667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39309 + ... + 44468.

It is an arithmetic number, because the mean of its divisors is an integer number (12901812).

Almost surely, 2^216144660 is an apocalyptic number.

216144660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216144660 is an abundant number, since it is smaller than the sum of its proper divisors (403142316).

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

216144660 is a wasteful number, since it uses less digits than its factorization.

216144660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83832 (or 83830 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 216144660 is about 14701.8590661181. The cubic root of 216144660 is about 600.1339145537.

The spelling of 216144660 in words is "two hundred sixteen million, one hundred forty-four thousand, six hundred sixty".