667711044 has 216 divisors, whose sum is σ = 2307509568. Its totient is φ = 160030080.

The previous prime is 667711027. The next prime is 667711087. The reversal of 667711044 is 440117766.

667711044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 71 ways as a sum of consecutive naturals, for example, 250929 + ... + 253575.

Almost surely, 2^667711044 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 667711044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1153754784).

667711044 is an abundant number, since it is smaller than the sum of its proper divisors (1639798524).

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

667711044 is a wasteful number, since it uses less digits than its factorization.

667711044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2695 (or 2683 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 667711044 is about 25840.1053403426. The cubic root of 667711044 is about 874.0364005527.

The spelling of 667711044 in words is "six hundred sixty-seven million, seven hundred eleven thousand, forty-four".