668379544 has 64 divisors (see below), whose sum is σ = 1480723200. Its totient is φ = 276856704.

The previous prime is 668379541. The next prime is 668379577. The reversal of 668379544 is 445973866.

It is a junction number, because it is equal to n+sod(n) for n = 668379491 and 668379500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668379541) 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, 336747 + ... + 338725.

It is an arithmetic number, because the mean of its divisors is an integer number (23136300).

Almost surely, 2^668379544 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 668379544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740361600).

668379544 is an abundant number, since it is smaller than the sum of its proper divisors (812343656).

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

668379544 is a wasteful number, since it uses less digits than its factorization.

668379544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192 (or 2188 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 52.

The square root of 668379544 is about 25853.0374230960. The cubic root of 668379544 is about 874.3279929777.

The spelling of 668379544 in words is "six hundred sixty-eight million, three hundred seventy-nine thousand, five hundred forty-four".