68440 has 32 divisors (see below), whose sum is σ = 162000. Its totient is φ = 25984.

The previous prime is 68437. The next prime is 68443. The reversal of 68440 is 4486.

It is an interprime number because it is at equal distance from previous prime (68437) and next prime (68443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1131 + ... + 1189.

2⁶⁸⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81000).

68440 is an abundant number, since it is smaller than the sum of its proper divisors (93560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68440 is a wasteful number, since it uses less digits than its factorization.

68440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 68440 is about 261.6103973469. The cubic root of 68440 is about 40.9043975162.

The spelling of 68440 in words is "sixty-eight thousand, four hundred forty".