718638 has 8 divisors (see below), whose sum is σ = 1437288. Its totient is φ = 239544.

The previous prime is 718633. The next prime is 718657. The reversal of 718638 is 836817.

It is a sphenic number, since it is the product of 3 distinct primes.

718638 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 718599 and 718608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59881 + ... + 59892.

It is an arithmetic number, because the mean of its divisors is an integer number (179661).

2⁷¹⁸⁶³⁸ is an apocalyptic number.

718638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

718638 is a wasteful number, since it uses less digits than its factorization.

718638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119778.

The product of its digits is 8064, while the sum is 33.

The square root of 718638 is about 847.7251913209. The cubic root of 718638 is about 89.5715437643.

The spelling of 718638 in words is "seven hundred eighteen thousand, six hundred thirty-eight".