669754 has 4 divisors (see below), whose sum is σ = 1004634. Its totient is φ = 334876.

The previous prime is 669733. The next prime is 669763. The reversal of 669754 is 457966.

669754 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 457966 = 2 ⋅228983.

It can be written as a sum of positive squares in only one way, i.e., 442225 + 227529 = 665^2 + 477^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167437 + ... + 167440.

2⁶⁶⁹⁷⁵⁴ is an apocalyptic number.

669754 is a deficient number, since it is larger than the sum of its proper divisors (334880).

669754 is a wasteful number, since it uses less digits than its factorization.

669754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334879.

The product of its digits is 45360, while the sum is 37.

The square root of 669754 is about 818.3849949749. The cubic root of 669754 is about 87.4926905459.

The spelling of 669754 in words is "six hundred sixty-nine thousand, seven hundred fifty-four".