666703404 has 72 divisors (see below), whose sum is σ = 1721577312. Its totient is φ = 217486080.

The previous prime is 666703327. The next prime is 666703423. The reversal of 666703404 is 404307666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 511017 + ... + 512319.

It is an arithmetic number, because the mean of its divisors is an integer number (23910796).

Almost surely, 2^666703404 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 666703404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (860788656).

666703404 is an abundant number, since it is smaller than the sum of its proper divisors (1054873908).

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

666703404 is a wasteful number, since it uses less digits than its factorization.

666703404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607 (or 1602 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 666703404 is about 25820.6003803165. The cubic root of 666703404 is about 873.5965109499.

The spelling of 666703404 in words is "six hundred sixty-six million, seven hundred three thousand, four hundred four".