667540 has 12 divisors (see below), whose sum is σ = 1401876. Its totient is φ = 267008.

The previous prime is 667531. The next prime is 667547. The reversal of 667540 is 45766.

667540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 367236 + 300304 = 606^2 + 548^2 .

It is a junction number, because it is equal to n+sod(n) for n = 667499 and 667508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667547) 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, 16669 + ... + 16708.

It is an arithmetic number, because the mean of its divisors is an integer number (116823).

2⁶⁶⁷⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

667540 is an abundant number, since it is smaller than the sum of its proper divisors (734336).

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

667540 is a wasteful number, since it uses less digits than its factorization.

667540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33386 (or 33384 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 667540 is about 817.0312111541. The cubic root of 667540 is about 87.3961761755.

The spelling of 667540 in words is "six hundred sixty-seven thousand, five hundred forty".