668751 has 8 divisors (see below), whose sum is σ = 913584. Its totient is φ = 434880.

The previous prime is 668747. The next prime is 668761. The reversal of 668751 is 157866.

668751 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 not a de Polignac number, because 668751 - 2² = 668747 is a prime.

It is a plaindrome in base 14.

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 668751.

It is not an unprimeable number, because it can be changed into a prime (668741) 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, 2596 + ... + 2841.

It is an arithmetic number, because the mean of its divisors is an integer number (114198).

2⁶⁶⁸⁷⁵¹ is an apocalyptic number.

668751 is a deficient number, since it is larger than the sum of its proper divisors (244833).

668751 is a wasteful number, since it uses less digits than its factorization.

668751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5481.

The product of its digits is 10080, while the sum is 33.

The square root of 668751 is about 817.7719731074. The cubic root of 668751 is about 87.4489934016.

The spelling of 668751 in words is "six hundred sixty-eight thousand, seven hundred fifty-one".