667530 has 24 divisors (see below), whose sum is σ = 1735812. Its totient is φ = 177984.

The previous prime is 667519. The next prime is 667531. The reversal of 667530 is 35766.

667530 is nontrivially palindromic in base 4.

667530 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 660969 + 6561 = 813^2 + 81^2 .

It is a junction number, because it is equal to n+sod(n) for n = 667494 and 667503.

It is not an unprimeable number, because it can be changed into a prime (667531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3619 + ... + 3798.

2⁶⁶⁷⁵³⁰ is an apocalyptic number.

667530 is an abundant number, since it is smaller than the sum of its proper divisors (1068282).

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

667530 is a wasteful number, since it uses less digits than its factorization.

667530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7430 (or 7427 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 667530 is about 817.0250914140. The cubic root of 667530 is about 87.3957397641.

The spelling of 667530 in words is "six hundred sixty-seven thousand, five hundred thirty".