667376440 has 64 divisors (see below), whose sum is σ = 1529539200. Its totient is φ = 262027392.

The previous prime is 667376431. The next prime is 667376443. The reversal of 667376440 is 44673766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667376443) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 593719 + ... + 594841.

It is an arithmetic number, because the mean of its divisors is an integer number (23899050).

Almost surely, 2^667376440 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 667376440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764769600).

667376440 is an abundant number, since it is smaller than the sum of its proper divisors (862162760).

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

667376440 is a wasteful number, since it uses less digits than its factorization.

667376440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396 (or 1392 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 43.

The square root of 667376440 is about 25833.6300198017. The cubic root of 667376440 is about 873.8903768378.

The spelling of 667376440 in words is "six hundred sixty-seven million, three hundred seventy-six thousand, four hundred forty".