668320272 has 60 divisors (see below), whose sum is σ = 1872977964. Its totient is φ = 222462720.

The previous prime is 668320259. The next prime is 668320277. The reversal of 668320272 is 272023866.

668320272 is a `hidden beast` number, since 6 + 68 + 320 + 272 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 356303376 + 312016896 = 18876^2 + 17664^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (668320277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115398 + ... + 121050.

Almost surely, 2^668320272 is an apocalyptic number.

It is an amenable number.

668320272 is an abundant number, since it is smaller than the sum of its proper divisors (1204657692).

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

668320272 is a wasteful number, since it uses less digits than its factorization.

668320272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6488 (or 6479 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 668320272 is about 25851.8910720280. The cubic root of 668320272 is about 874.3021470337.

The spelling of 668320272 in words is "six hundred sixty-eight million, three hundred twenty thousand, two hundred seventy-two".