668452212 has 36 divisors (see below), whose sum is σ = 1735369636. Its totient is φ = 216794880.

The previous prime is 668452199. The next prime is 668452217. The reversal of 668452212 is 212254866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 252047376 + 416404836 = 15876^2 + 20406^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668452217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 249589 + ... + 252252.

Almost surely, 2^668452212 is an apocalyptic number.

It is an amenable number.

668452212 is an abundant number, since it is smaller than the sum of its proper divisors (1066917424).

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

668452212 is a wasteful number, since it uses less digits than its factorization.

668452212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501888 (or 501883 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 668452212 is about 25854.4427903600. The cubic root of 668452212 is about 874.3596782503.

The spelling of 668452212 in words is "six hundred sixty-eight million, four hundred fifty-two thousand, two hundred twelve".