212443664 has 10 divisors (see below), whose sum is σ = 411609630. Its totient is φ = 106221824.

The previous prime is 212443657. The next prime is 212443687. The reversal of 212443664 is 466344212.

It can be written as a sum of positive squares in only one way, i.e., 166203664 + 46240000 = 12892^2 + 6800^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 212443664.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6638849 + ... + 6638880.

It is an arithmetic number, because the mean of its divisors is an integer number (41160963).

Almost surely, 2^212443664 is an apocalyptic number.

It is an amenable number.

212443664 is a deficient number, since it is larger than the sum of its proper divisors (199165966).

212443664 is a wasteful number, since it uses less digits than its factorization.

212443664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13277737 (or 13277731 counting only the distinct ones).

The product of its digits is 27648, while the sum is 32.

The square root of 212443664 is about 14575.4473001689. The cubic root of 212443664 is about 596.6888571310.

Adding to 212443664 its reverse (466344212), we get a palindrome (678787876).

The spelling of 212443664 in words is "two hundred twelve million, four hundred forty-three thousand, six hundred sixty-four".