668329560 has 192 divisors, whose sum is σ = 2302560000. Its totient is φ = 167650560.

The previous prime is 668329559. The next prime is 668329577. The reversal of 668329560 is 65923866.

It is a happy number.

668329560 is a `hidden beast` number, since 6 + 6 + 83 + 2 + 9 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1360915 + ... + 1361405.

It is an arithmetic number, because the mean of its divisors is an integer number (11992500).

Almost surely, 2^668329560 is an apocalyptic number.

668329560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668329560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1151280000).

668329560 is an abundant number, since it is smaller than the sum of its proper divisors (1634230440).

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

668329560 is a wasteful number, since it uses less digits than its factorization.

668329560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726 (or 719 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 668329560 is about 25852.0707100998. The cubic root of 668329560 is about 874.3061972280.

The spelling of 668329560 in words is "six hundred sixty-eight million, three hundred twenty-nine thousand, five hundred sixty".