668900544 has 112 divisors (see below), whose sum is σ = 1971873120. Its totient is φ = 198696960.

The previous prime is 668900543. The next prime is 668900579. The reversal of 668900544 is 445009866.

It is a junction number, because it is equal to n+sod(n) for n = 668900496 and 668900505.

It is not an unprimeable number, because it can be changed into a prime (668900543) 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, 67764 + ... + 77004.

It is an arithmetic number, because the mean of its divisors is an integer number (17606010).

Almost surely, 2^668900544 is an apocalyptic number.

668900544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668900544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (985936560).

668900544 is an abundant number, since it is smaller than the sum of its proper divisors (1302972576).

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

668900544 is a wasteful number, since it uses less digits than its factorization.

668900544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9298 (or 9288 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 668900544 is about 25863.1116457398. Note that the first 3 decimals coincide. The cubic root of 668900544 is about 874.5551127230. Note that the first 3 decimals are identical.

The spelling of 668900544 in words is "six hundred sixty-eight million, nine hundred thousand, five hundred forty-four".