68641 has 4 divisors (see below), whose sum is σ = 69552. Its totient is φ = 67732.

The previous prime is 68639. The next prime is 68659. The reversal of 68641 is 14686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68641 - 2¹ = 68639 is a prime.

It is a d-powerful number, because it can be written as 6⁴ + 8³ + 6⁴ + 4⁸ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331 + ... + 496.

It is an arithmetic number, because the mean of its divisors is an integer number (17388).

2⁶⁸⁶⁴¹ is an apocalyptic number.

68641 is the 166-th heptagonal number.

It is an amenable number.

68641 is a deficient number, since it is larger than the sum of its proper divisors (911).

68641 is an equidigital number, since it uses as much as digits as its factorization.

68641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910.

The product of its digits is 1152, while the sum is 25.

The square root of 68641 is about 261.9942747466. The cubic root of 68641 is about 40.9444021344.

It can be divided in two parts, 686 and 41, that added together give a palindrome (727).

The spelling of 68641 in words is "sixty-eight thousand, six hundred forty-one".