681380 has 48 divisors (see below), whose sum is σ = 1698816. Its totient is φ = 224640.

The previous prime is 681371. The next prime is 681403. The reversal of 681380 is 83186.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4262 + ... + 4418.

It is an arithmetic number, because the mean of its divisors is an integer number (35392).

2⁶⁸¹³⁸⁰ 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 681380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (849408).

681380 is an abundant number, since it is smaller than the sum of its proper divisors (1017436).

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

681380 is a wasteful number, since it uses less digits than its factorization.

681380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 681380 is about 825.4574489336. The cubic root of 681380 is about 87.9960397667.

The spelling of 681380 in words is "six hundred eighty-one thousand, three hundred eighty".