667698 has 16 divisors (see below), whose sum is σ = 1405920. Its totient is φ = 210816.

The previous prime is 667697. The next prime is 667699. The reversal of 667698 is 896766.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (667697) and next prime (667699).

It is a d-powerful number, because it can be written as 6⁵ + 6⁶ + 6⁶ + 7⁴ + 9⁶ + 8⁵ .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 667698.

It is not an unprimeable number, because it can be changed into a prime (667691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2815 + ... + 3042.

It is an arithmetic number, because the mean of its divisors is an integer number (87870).

2⁶⁶⁷⁶⁹⁸ is an apocalyptic number.

667698 is an abundant number, since it is smaller than the sum of its proper divisors (738222).

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

667698 is a wasteful number, since it uses less digits than its factorization.

667698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5881.

The product of its digits is 108864, while the sum is 42.

The square root of 667698 is about 817.1278969660. The cubic root of 667698 is about 87.4030708966.

The spelling of 667698 in words is "six hundred sixty-seven thousand, six hundred ninety-eight".