668754 has 24 divisors (see below), whose sum is σ = 1478412. Its totient is φ = 218400.

The previous prime is 668747. The next prime is 668761. The reversal of 668754 is 457866.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (668747) and next prime (668761).

It can be written as a sum of positive squares in 2 ways, for example, as 603729 + 65025 = 777^2 + 255^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668754.

It is an unprimeable number.

668754 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 604 + ... + 1304.

2⁶⁶⁸⁷⁵⁴ is an apocalyptic number.

668754 is an abundant number, since it is smaller than the sum of its proper divisors (809658).

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

668754 is a wasteful number, since it uses less digits than its factorization.

668754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762 (or 759 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 668754 is about 817.7738073575. The cubic root of 668754 is about 87.4491241661.

The spelling of 668754 in words is "six hundred sixty-eight thousand, seven hundred fifty-four".