257669 has 8 divisors (see below), whose sum is σ = 285120. Its totient is φ = 231616.

The previous prime is 257657. The next prime is 257671. The reversal of 257669 is 966752.

257669 = 70² + 71² + ... + 103².

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

It is a cyclic number.

It is not a de Polignac number, because 257669 - 2¹² = 253573 is a prime.

It is a super-2 number, since 2×257669² = 132786627122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62 + ... + 720.

It is an arithmetic number, because the mean of its divisors is an integer number (35640).

2²⁵⁷⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

257669 is a deficient number, since it is larger than the sum of its proper divisors (27451).

257669 is a wasteful number, since it uses less digits than its factorization.

257669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699.

The product of its digits is 22680, while the sum is 35.

The square root of 257669 is about 507.6110715893. The cubic root of 257669 is about 63.6337314310.

The spelling of 257669 in words is "two hundred fifty-seven thousand, six hundred sixty-nine".