681144 has 32 divisors (see below), whose sum is σ = 1725840. Its totient is φ = 224000.

The previous prime is 681137. The next prime is 681151. The reversal of 681144 is 441186.

It is an interprime number because it is at equal distance from previous prime (681137) and next prime (681151).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681144.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2284 + ... + 2564.

2⁶⁸¹¹⁴⁴ is an apocalyptic number.

It is an amenable number.

681144 is an abundant number, since it is smaller than the sum of its proper divisors (1044696).

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

681144 is a wasteful number, since it uses less digits than its factorization.

681144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 387 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

The square root of 681144 is about 825.3144855145. The cubic root of 681144 is about 87.9858792770.

The spelling of 681144 in words is "six hundred eighty-one thousand, one hundred forty-four".