667412538 has 16 divisors (see below), whose sum is σ = 1437504096. Its totient is φ = 205357680.

The previous prime is 667412509. The next prime is 667412561. The reversal of 667412538 is 835214766.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 667412538.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4278208 + ... + 4278363.

It is an arithmetic number, because the mean of its divisors is an integer number (89844006).

Almost surely, 2^667412538 is an apocalyptic number.

667412538 is an abundant number, since it is smaller than the sum of its proper divisors (770091558).

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

667412538 is a wasteful number, since it uses less digits than its factorization.

667412538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8556589.

The product of its digits is 241920, while the sum is 42.

The square root of 667412538 is about 25834.3286732982. The cubic root of 667412538 is about 873.9061326263.

The spelling of 667412538 in words is "six hundred sixty-seven million, four hundred twelve thousand, five hundred thirty-eight".