706781 has 4 divisors (see below), whose sum is σ = 744000. Its totient is φ = 669564.

The previous prime is 706763. The next prime is 706787. The reversal of 706781 is 187607.

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: 187607 = 7 ⋅26801.

It is a cyclic number.

It is not a de Polignac number, because 706781 - 2¹⁴ = 690397 is a prime.

It is a super-2 number, since 2×706781² = 999078763922, which contains 22 as substring.

It is a Duffinian number.

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 706781.

It is not an unprimeable number, because it can be changed into a prime (706787) 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 3 ways as a sum of consecutive naturals, for example, 18581 + ... + 18618.

It is an arithmetic number, because the mean of its divisors is an integer number (186000).

2⁷⁰⁶⁷⁸¹ is an apocalyptic number.

It is an amenable number.

706781 is a deficient number, since it is larger than the sum of its proper divisors (37219).

706781 is a wasteful number, since it uses less digits than its factorization.

706781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37218.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 706781 is about 840.7026822843. The cubic root of 706781 is about 89.0761877598.

The spelling of 706781 in words is "seven hundred six thousand, seven hundred eighty-one".