668487 has 8 divisors (see below), whose sum is σ = 895104. Its totient is φ = 443768.

The previous prime is 668471. The next prime is 668509. The reversal of 668487 is 784866.

668487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668487 - 2⁴ = 668471 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668487.

It is not an unprimeable number, because it can be changed into a prime (668407) 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, 1078 + ... + 1580.

It is an arithmetic number, because the mean of its divisors is an integer number (111888).

2⁶⁶⁸⁴⁸⁷ is an apocalyptic number.

668487 is a deficient number, since it is larger than the sum of its proper divisors (226617).

668487 is a wasteful number, since it uses less digits than its factorization.

668487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949.

The product of its digits is 64512, while the sum is 39.

The square root of 668487 is about 817.6105429849. The cubic root of 668487 is about 87.4374845975.

The spelling of 668487 in words is "six hundred sixty-eight thousand, four hundred eighty-seven".