681750407 has 8 divisors (see below), whose sum is σ = 734395536. Its totient is φ = 629134272.

The previous prime is 681750403. The next prime is 681750427. The reversal of 681750407 is 704057186.

681750407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 681750407 - 2² = 681750403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681750401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89648 + ... + 96954.

It is an arithmetic number, because the mean of its divisors is an integer number (91799442).

Almost surely, 2^681750407 is an apocalyptic number.

681750407 is a deficient number, since it is larger than the sum of its proper divisors (52645129).

681750407 is a wasteful number, since it uses less digits than its factorization.

681750407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14497.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 681750407 is about 26110.3505721390. The cubic root of 681750407 is about 880.1198214081.

The spelling of 681750407 in words is "six hundred eighty-one million, seven hundred fifty thousand, four hundred seven".