667492487 has 4 divisors (see below), whose sum is σ = 671489616. Its totient is φ = 663495360.

The previous prime is 667492451. The next prime is 667492489. The reversal of 667492487 is 784294766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667492487 - 2²² = 663298183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667492489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1998314 + ... + 1998647.

It is an arithmetic number, because the mean of its divisors is an integer number (167872404).

Almost surely, 2^667492487 is an apocalyptic number.

667492487 is a deficient number, since it is larger than the sum of its proper divisors (3997129).

667492487 is a wasteful number, since it uses less digits than its factorization.

667492487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997128.

The product of its digits is 4064256, while the sum is 53.

The square root of 667492487 is about 25835.8759673443. The cubic root of 667492487 is about 873.9410261531.

The spelling of 667492487 in words is "six hundred sixty-seven million, four hundred ninety-two thousand, four hundred eighty-seven".