668179772 has 24 divisors (see below), whose sum is σ = 1267728000. Its totient is φ = 306317376.

The previous prime is 668179753. The next prime is 668179789. The reversal of 668179772 is 277971866.

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, 35372 + ... + 50867.

It is an arithmetic number, because the mean of its divisors is an integer number (52822000).

Almost surely, 2^668179772 is an apocalyptic number.

It is an amenable number.

668179772 is a deficient number, since it is larger than the sum of its proper divisors (599548228).

668179772 is a wasteful number, since it uses less digits than its factorization.

668179772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86405 (or 86403 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 53.

The square root of 668179772 is about 25849.1735264399. The cubic root of 668179772 is about 874.2408749830.

The spelling of 668179772 in words is "six hundred sixty-eight million, one hundred seventy-nine thousand, seven hundred seventy-two".