681470 has 8 divisors (see below), whose sum is σ = 1226664. Its totient is φ = 272584.

The previous prime is 681451. The next prime is 681481. The reversal of 681470 is 74186.

681470 = 175² + 176² + ... + 194².

It is a sphenic number, since it is the product of 3 distinct primes.

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 681470.

It is an unprimeable number.

681470 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34064 + ... + 34083.

It is an arithmetic number, because the mean of its divisors is an integer number (153333).

2⁶⁸¹⁴⁷⁰ is an apocalyptic number.

681470 is a deficient number, since it is larger than the sum of its proper divisors (545194).

681470 is a wasteful number, since it uses less digits than its factorization.

681470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68154.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 681470 is about 825.5119623603. The cubic root of 681470 is about 87.9999139118. Note that the first 4 decimals are identical.

The spelling of 681470 in words is "six hundred eighty-one thousand, four hundred seventy".