667404440 has 16 divisors (see below), whose sum is σ = 1501660080. Its totient is φ = 266961760.

The previous prime is 667404407. The next prime is 667404449. The reversal of 667404440 is 44404766.

667404440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 667404440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667404449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8342516 + ... + 8342595.

It is an arithmetic number, because the mean of its divisors is an integer number (93853755).

Almost surely, 2^667404440 is an apocalyptic number.

It is an amenable number.

667404440 is an abundant number, since it is smaller than the sum of its proper divisors (834255640).

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

667404440 is a wasteful number, since it uses less digits than its factorization.

667404440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16685122 (or 16685118 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 35.

The square root of 667404440 is about 25834.1719433776. The cubic root of 667404440 is about 873.9025981205.

The spelling of 667404440 in words is "six hundred sixty-seven million, four hundred four thousand, four hundred forty".