213966660 has 48 divisors (see below), whose sum is σ = 601981632. Its totient is φ = 56784000.

The previous prime is 213966617. The next prime is 213966689. The reversal of 213966660 is 66669312.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4210 + ... + 21110.

It is an arithmetic number, because the mean of its divisors is an integer number (12541284).

Almost surely, 2^213966660 is an apocalyptic number.

213966660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213966660 is an abundant number, since it is smaller than the sum of its proper divisors (388014972).

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

213966660 is a wasteful number, since it uses less digits than its factorization.

213966660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17124 (or 17122 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 213966660 is about 14627.5992562006. The cubic root of 213966660 is about 598.1113389481. Note that the first 3 decimals are identical.

The spelling of 213966660 in words is "two hundred thirteen million, nine hundred sixty-six thousand, six hundred sixty".