718668 has 18 divisors (see below), whose sum is σ = 1816724. Its totient is φ = 239544.

The previous prime is 718661. The next prime is 718691. The reversal of 718668 is 866817.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 19963 = 718668 / (7 + 1 + 8 + 6 + 6 + 8).

It is not an unprimeable number, because it can be changed into a prime (718661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9946 + ... + 10017.

2⁷¹⁸⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

718668 is an abundant number, since it is smaller than the sum of its proper divisors (1098056).

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

718668 is a wasteful number, since it uses less digits than its factorization.

718668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19973 (or 19968 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 718668 is about 847.7428855496. The cubic root of 718668 is about 89.5727901540.

The spelling of 718668 in words is "seven hundred eighteen thousand, six hundred sixty-eight".