668006772 has 24 divisors (see below), whose sum is σ = 1650370176. Its totient is φ = 209570688.

The previous prime is 668006771. The next prime is 668006813. The reversal of 668006772 is 277600866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668006771) 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 7 ways as a sum of consecutive naturals, for example, 1637068 + ... + 1637475.

It is an arithmetic number, because the mean of its divisors is an integer number (68765424).

Almost surely, 2^668006772 is an apocalyptic number.

It is an amenable number.

668006772 is an abundant number, since it is smaller than the sum of its proper divisors (982363404).

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

668006772 is a wasteful number, since it uses less digits than its factorization.

668006772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3274567 (or 3274565 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 668006772 is about 25845.8269745814. The cubic root of 668006772 is about 874.1654178817.

The spelling of 668006772 in words is "six hundred sixty-eight million, six thousand, seven hundred seventy-two".