668416770 has 144 divisors (see below), whose sum is σ = 2096902080. Its totient is φ = 144690624.

The previous prime is 668416769. The next prime is 668416783. The reversal of 668416770 is 77614866.

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 polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 225961 + ... + 228899.

It is an arithmetic number, because the mean of its divisors is an integer number (14561820).

Almost surely, 2^668416770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668416770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1048451040).

668416770 is an abundant number, since it is smaller than the sum of its proper divisors (1428485310).

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

668416770 is a wasteful number, since it uses less digits than its factorization.

668416770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997 (or 2975 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 668416770 is about 25853.7573671604. The cubic root of 668416770 is about 874.3442248378.

The spelling of 668416770 in words is "six hundred sixty-eight million, four hundred sixteen thousand, seven hundred seventy".