668775 has 24 divisors (see below), whose sum is σ = 1140304. Its totient is φ = 345600.

The previous prime is 668761. The next prime is 668791. The reversal of 668775 is 577866.

668775 = T₃₈₁ + T₃₈₂ + ... + T₃₈₉.

668775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668775 - 2¹¹ = 666727 is a prime.

It is a Duffinian number.

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 668775.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2655 + ... + 2895.

2⁶⁶⁸⁷⁷⁵ is an apocalyptic number.

668775 is a deficient number, since it is larger than the sum of its proper divisors (471529).

668775 is a wasteful number, since it uses less digits than its factorization.

668775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 286 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 668775 is about 817.7866469930. The cubic root of 668775 is about 87.4500395063.

Subtracting from 668775 its reverse (577866), we obtain a palindrome (90909).

The spelling of 668775 in words is "six hundred sixty-eight thousand, seven hundred seventy-five".