666703744 has 64 divisors (see below), whose sum is σ = 1538886240. Its totient is φ = 281788416.

The previous prime is 666703721. The next prime is 666703757. The reversal of 666703744 is 447307666.

666703744 = 2986² + 2987² + ... + 3058².

666703744 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 666703744.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60312 + ... + 70504.

Almost surely, 2^666703744 is an apocalyptic number.

666703744 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 666703744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (769443120).

666703744 is an abundant number, since it is smaller than the sum of its proper divisors (872182496).

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

666703744 is a wasteful number, since it uses less digits than its factorization.

666703744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10287 (or 10275 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 43.

The square root of 666703744 is about 25820.6069642059. The cubic root of 666703744 is about 873.5966594531.

The spelling of 666703744 in words is "six hundred sixty-six million, seven hundred three thousand, seven hundred forty-four".