668923450 has 24 divisors (see below), whose sum is σ = 1339906428. Its totient is φ = 246986880.

The previous prime is 668923439. The next prime is 668923459. The reversal of 668923450 is 54329866.

668923450 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 271359729 + 397563721 = 16473^2 + 19939^2 .

It is a junction number, because it is equal to n+sod(n) for n = 668923397 and 668923406.

It is not an unprimeable number, because it can be changed into a prime (668923459) 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, 513907 + ... + 515206.

Almost surely, 2^668923450 is an apocalyptic number.

668923450 is an abundant number, since it is smaller than the sum of its proper divisors (670982978).

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

668923450 is a wasteful number, since it uses less digits than its factorization.

668923450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029138 (or 1029133 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 668923450 is about 25863.5544734284. The cubic root of 668923450 is about 874.5650954382.

The spelling of 668923450 in words is "six hundred sixty-eight million, nine hundred twenty-three thousand, four hundred fifty".