641669 has 8 divisors (see below), whose sum is σ = 757248. Its totient is φ = 532080.

The previous prime is 641639. The next prime is 641681. The reversal of 641669 is 966146.

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 641669 - 2⁸ = 641413 is a prime.

It is a super-2 number, since 2×641669² = 823478211122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1262 + ... + 1695.

It is an arithmetic number, because the mean of its divisors is an integer number (94656).

2⁶⁴¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

641669 is a deficient number, since it is larger than the sum of its proper divisors (115579).

641669 is a wasteful number, since it uses less digits than its factorization.

641669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2995.

The product of its digits is 7776, while the sum is 32.

The square root of 641669 is about 801.0424458167. The cubic root of 641669 is about 86.2522340666.

The spelling of 641669 in words is "six hundred forty-one thousand, six hundred sixty-nine".