668949420 has 48 divisors (see below), whose sum is σ = 1876896000. Its totient is φ = 178021056.

The previous prime is 668949419. The next prime is 668949427. The reversal of 668949420 is 24949866.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 668949420.

It is not an unprimeable number, because it can be changed into a prime (668949427) 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, 18769 + ... + 41111.

It is an arithmetic number, because the mean of its divisors is an integer number (39102000).

Almost surely, 2^668949420 is an apocalyptic number.

668949420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668949420 is an abundant number, since it is smaller than the sum of its proper divisors (1207946580).

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

668949420 is a wasteful number, since it uses less digits than its factorization.

668949420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22854 (or 22852 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 668949420 is about 25864.0565263843. The cubic root of 668949420 is about 874.5764132064.

The spelling of 668949420 in words is "six hundred sixty-eight million, nine hundred forty-nine thousand, four hundred twenty".