681450 has 96 divisors (see below), whose sum is σ = 2142720. Its totient is φ = 139200.

The previous prime is 681449. The next prime is 681451. The reversal of 681450 is 54186.

It is an interprime number because it is at equal distance from previous prime (681449) and next prime (681451).

It is a self number, because there is not a number n which added to its sum of digits gives 681450.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681451) 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 47 ways as a sum of consecutive naturals, for example, 11521 + ... + 11579.

It is an arithmetic number, because the mean of its divisors is an integer number (22320).

2⁶⁸¹⁴⁵⁰ is an apocalyptic number.

It is a pronic number, being equal to 825×826.

It is a practical number, because each smaller number is the sum of distinct divisors of 681450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1071360).

681450 is an abundant number, since it is smaller than the sum of its proper divisors (1461270).

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

681450 is a wasteful number, since it uses less digits than its factorization.

681450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 681450 is about 825.4998485766. The cubic root of 681450 is about 87.9990530201. Note that the first 3 decimals are identical.

Subtracting from 681450 its reverse (54186), we obtain a square (627264 = 792²).

The spelling of 681450 in words is "six hundred eighty-one thousand, four hundred fifty".