669698 has 8 divisors (see below), whose sum is σ = 1063692. Its totient is φ = 315136.

The previous prime is 669689. The next prime is 669701. The reversal of 669698 is 896966.

It can be written as a sum of positive squares in 2 ways, for example, as 667489 + 2209 = 817^2 + 47^2 .

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

It is a super-2 number, since 2×669698² = 896990822408, which contains 22 as substring.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669698.

It is an unprimeable number.

669698 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, 9815 + ... + 9882.

2⁶⁶⁹⁶⁹⁸ is an apocalyptic number.

669698 is a deficient number, since it is larger than the sum of its proper divisors (393994).

669698 is a wasteful number, since it uses less digits than its factorization.

669698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19716.

The product of its digits is 139968, while the sum is 44.

The square root of 669698 is about 818.3507805336. The cubic root of 669698 is about 87.4902519753.

The spelling of 669698 in words is "six hundred sixty-nine thousand, six hundred ninety-eight".