706681 has 4 divisors (see below), whose sum is σ = 709632. Its totient is φ = 703732.

The previous prime is 706679. The next prime is 706703. The reversal of 706681 is 186607.

706681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186607 = 191 ⋅977.

It is a cyclic number.

It is not a de Polignac number, because 706681 - 2¹ = 706679 is a prime.

It is a super-2 number, since 2×706681² = 998796071522, which contains 22 as substring.

It is a Duffinian number.

706681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (706621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1081 + ... + 1606.

It is an arithmetic number, because the mean of its divisors is an integer number (177408).

2⁷⁰⁶⁶⁸¹ is an apocalyptic number.

It is an amenable number.

706681 is a deficient number, since it is larger than the sum of its proper divisors (2951).

706681 is a wasteful number, since it uses less digits than its factorization.

706681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2950.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 706681 is about 840.6432061225. The cubic root of 706681 is about 89.0719865344.

The spelling of 706681 in words is "seven hundred six thousand, six hundred eighty-one".