668678164 has 48 divisors (see below), whose sum is σ = 1461995136. Its totient is φ = 259977600.

The previous prime is 668678123. The next prime is 668678167. The reversal of 668678164 is 461876866.

It is a happy number.

668678164 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668678167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164622 + ... + 168634.

It is an arithmetic number, because the mean of its divisors is an integer number (30458232).

Almost surely, 2^668678164 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 668678164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (730997568).

668678164 is an abundant number, since it is smaller than the sum of its proper divisors (793316972).

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

668678164 is a wasteful number, since it uses less digits than its factorization.

668678164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4576 (or 4574 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 52.

The square root of 668678164 is about 25858.8121150218. The cubic root of 668678164 is about 874.4581849490.

The spelling of 668678164 in words is "six hundred sixty-eight million, six hundred seventy-eight thousand, one hundred sixty-four".