666673280 has 128 divisors (see below), whose sum is σ = 1961729280. Its totient is φ = 210972672.

The previous prime is 666673277. The next prime is 666673297. The reversal of 666673280 is 82376666.

It is a tau number, because it is divible by the number of its divisors (128).

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, 52517 + ... + 63963.

It is an arithmetic number, because the mean of its divisors is an integer number (15326010).

Almost surely, 2^666673280 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 666673280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (980864640).

666673280 is an abundant number, since it is smaller than the sum of its proper divisors (1295056000).

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

666673280 is a wasteful number, since it uses less digits than its factorization.

666673280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11486 (or 11474 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 666673280 is about 25820.0170410478. The cubic root of 666673280 is about 873.5833533662.

The spelling of 666673280 in words is "six hundred sixty-six million, six hundred seventy-three thousand, two hundred eighty".