668225724 has 24 divisors (see below), whose sum is σ = 1567362048. Its totient is φ = 221574960.

The previous prime is 668225689. The next prime is 668225731. The reversal of 668225724 is 427522866.

668225724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143482 + ... + 148065.

It is an arithmetic number, because the mean of its divisors is an integer number (65306752).

Almost surely, 2^668225724 is an apocalyptic number.

It is an amenable number.

668225724 is an abundant number, since it is smaller than the sum of its proper divisors (899136324).

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

668225724 is a wasteful number, since it uses less digits than its factorization.

668225724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291745 (or 291743 counting only the distinct ones).

The product of its digits is 322560, while the sum is 42.

The square root of 668225724 is about 25850.0623596927. The cubic root of 668225724 is about 874.2609155956.

The spelling of 668225724 in words is "six hundred sixty-eight million, two hundred twenty-five thousand, seven hundred twenty-four".