641769 has 16 divisors (see below), whose sum is σ = 912384. Its totient is φ = 400400.

The previous prime is 641761. The next prime is 641789. The reversal of 641769 is 967146.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 641769 - 2³ = 641761 is a prime.

It is a super-2 number, since 2×641769² = 823734898722, which contains 22 as substring.

It is a Curzon number.

641769 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (641761) 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 15 ways as a sum of consecutive naturals, for example, 4834 + ... + 4964.

It is an arithmetic number, because the mean of its divisors is an integer number (57024).

2⁶⁴¹⁷⁶⁹ is an apocalyptic number.

641769 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

641769 is a deficient number, since it is larger than the sum of its proper divisors (270615).

641769 is a wasteful number, since it uses less digits than its factorization.

641769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228.

The product of its digits is 9072, while the sum is 33.

The square root of 641769 is about 801.1048620499. The cubic root of 641769 is about 86.2567144531.

The spelling of 641769 in words is "six hundred forty-one thousand, seven hundred sixty-nine".