667880 has 32 divisors (see below), whose sum is σ = 1533600. Its totient is φ = 261696.

The previous prime is 667867. The next prime is 667883. The reversal of 667880 is 88766.

667880 = T₁₂₀ + T₁₂₁ + ... + T₁₇₈.

It is an Ulam number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 667880.

It is not an unprimeable number, because it can be changed into a prime (667883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2219 + ... + 2501.

It is an arithmetic number, because the mean of its divisors is an integer number (47925).

2⁶⁶⁷⁸⁸⁰ 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 667880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (766800).

667880 is an abundant number, since it is smaller than the sum of its proper divisors (865720).

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

667880 is a wasteful number, since it uses less digits than its factorization.

667880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 667880 is about 817.2392550533. The cubic root of 667880 is about 87.4110115693.

The spelling of 667880 in words is "six hundred sixty-seven thousand, eight hundred eighty".