667770444 has 108 divisors (see below), whose sum is σ = 1901139240. Its totient is φ = 197366400.

The previous prime is 667770427. The next prime is 667770451. The reversal of 667770444 is 444077766.

It is a self number, because there is not a number n which added to its sum of digits gives 667770444.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 176727 + ... + 180465.

Almost surely, 2^667770444 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 667770444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (950569620).

667770444 is an abundant number, since it is smaller than the sum of its proper divisors (1233368796).

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

667770444 is a wasteful number, since it uses less digits than its factorization.

667770444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812 (or 3796 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 45.

The square root of 667770444 is about 25841.2546909007. The cubic root of 667770444 is about 874.0623180626.

The spelling of 667770444 in words is "six hundred sixty-seven million, seven hundred seventy thousand, four hundred forty-four".