698666 has 8 divisors (see below), whose sum is σ = 1109700. Its totient is φ = 328768.

The previous prime is 698653. The next prime is 698669. The reversal of 698666 is 666896.

698666 = T₁₀₈ + T₁₀₉ + ... + T₁₇₅.

It can be written as a sum of positive squares in 2 ways, for example, as 555025 + 143641 = 745^2 + 379^2 .

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

It is not an unprimeable number, because it can be changed into a prime (698669) by changing a digit.

698666 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 in 3 ways as a sum of consecutive naturals, for example, 10241 + ... + 10308.

2⁶⁹⁸⁶⁶⁶ is an apocalyptic number.

698666 is a deficient number, since it is larger than the sum of its proper divisors (411034).

698666 is a wasteful number, since it uses less digits than its factorization.

698666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20568.

The product of its digits is 93312, while the sum is 41.

The square root of 698666 is about 835.8624288721. The cubic root of 698666 is about 88.7339612622.

The spelling of 698666 in words is "six hundred ninety-eight thousand, six hundred sixty-six".