668006748 has 36 divisors (see below), whose sum is σ = 1691551680. Its totient is φ = 222276096.

The previous prime is 668006743. The next prime is 668006771. The reversal of 668006748 is 847600866.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668006741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4693 + ... + 36851.

Almost surely, 2^668006748 is an apocalyptic number.

It is an amenable number.

668006748 is an abundant number, since it is smaller than the sum of its proper divisors (1023544932).

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

668006748 is a wasteful number, since it uses less digits than its factorization.

668006748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32746 (or 32741 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 668006748 is about 25845.8265102898. The cubic root of 668006748 is about 874.1654074128.

The spelling of 668006748 in words is "six hundred sixty-eight million, six thousand, seven hundred forty-eight".