668488 has 8 divisors (see below), whose sum is σ = 1253430. Its totient is φ = 334240.

The previous prime is 668471. The next prime is 668509. The reversal of 668488 is 884866.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 636804 + 31684 = 798^2 + 178^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×668488² = 893752412288, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 668488.

It is an unprimeable number.

668488 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 as a sum of consecutive naturals, namely, 41773 + ... + 41788.

2⁶⁶⁸⁴⁸⁸ is an apocalyptic number.

It is an amenable number.

668488 is a deficient number, since it is larger than the sum of its proper divisors (584942).

668488 is a wasteful number, since it uses less digits than its factorization.

668488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83567 (or 83563 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 668488 is about 817.6111545227. The cubic root of 668488 is about 87.4375281971.

It can be divided in two parts, 668 and 488, that added together give a square (1156 = 34²).

The spelling of 668488 in words is "six hundred sixty-eight thousand, four hundred eighty-eight".