212330640 has 80 divisors (see below), whose sum is σ = 661136256. Its totient is φ = 56371200.

The previous prime is 212330639. The next prime is 212330659. The reversal of 212330640 is 46033212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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, 56005 + ... + 59675.

Almost surely, 2^212330640 is an apocalyptic number.

212330640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212330640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330568128).

212330640 is an abundant number, since it is smaller than the sum of its proper divisors (448805616).

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

212330640 is a wasteful number, since it uses less digits than its factorization.

212330640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3928 (or 3922 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 212330640 is about 14571.5695791497. The cubic root of 212330640 is about 596.5830218185.

Adding to 212330640 its reverse (46033212), we get a palindrome (258363852).

The spelling of 212330640 in words is "two hundred twelve million, three hundred thirty thousand, six hundred forty".