6666738 has 32 divisors (see below), whose sum is σ = 14493696. Its totient is φ = 2032128.

The previous prime is 6666719. The next prime is 6666749. The reversal of 6666738 is 8376666.

It is a self number, because there is not a number n which added to its sum of digits gives 6666738.

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, 9570 + ... + 10242.

It is an arithmetic number, because the mean of its divisors is an integer number (452928).

Almost surely, 2^6666738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6666738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7246848).

6666738 is an abundant number, since it is smaller than the sum of its proper divisors (7826958).

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

6666738 is a wasteful number, since it uses less digits than its factorization.

6666738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818.

The product of its digits is 217728, while the sum is 42.

The square root of 6666738 is about 2582.0027110753. The cubic root of 6666738 is about 188.2078770462.

The spelling of 6666738 in words is "six million, six hundred sixty-six thousand, seven hundred thirty-eight".