668836344 has 64 divisors (see below), whose sum is σ = 1851373440. Its totient is φ = 199647360.

The previous prime is 668836339. The next prime is 668836361. The reversal of 668836344 is 443638866.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 668836293 and 668836302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1219 + ... + 36594.

It is an arithmetic number, because the mean of its divisors is an integer number (28927710).

Almost surely, 2^668836344 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 668836344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (925686720).

668836344 is an abundant number, since it is smaller than the sum of its proper divisors (1182537096).

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

668836344 is a wasteful number, since it uses less digits than its factorization.

668836344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37900 (or 37896 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 48.

The square root of 668836344 is about 25861.8704659968. The cubic root of 668836344 is about 874.5271323628.

The spelling of 668836344 in words is "six hundred sixty-eight million, eight hundred thirty-six thousand, three hundred forty-four".