668428160 has 64 divisors (see below), whose sum is σ = 1601175600. Its totient is φ = 266833920.

The previous prime is 668428157. The next prime is 668428177. The reversal of 668428160 is 61824866.

It is a tau number, because it is divible by the number of its divisors (64).

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, 517115 + ... + 518405.

Almost surely, 2^668428160 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668428160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800587800).

668428160 is an abundant number, since it is smaller than the sum of its proper divisors (932747440).

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

668428160 is a wasteful number, since it uses less digits than its factorization.

668428160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119 (or 2107 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 668428160 is about 25853.9776436818. The cubic root of 668428160 is about 874.3491911625.

The spelling of 668428160 in words is "six hundred sixty-eight million, four hundred twenty-eight thousand, one hundred sixty".