706581 has 6 divisors (see below), whose sum is σ = 1020630. Its totient is φ = 471048.

The previous prime is 706561. The next prime is 706597. The reversal of 706581 is 185607.

706581 is a `hidden beast` number, since 7 + 0 + 658 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 695556 + 11025 = 834^2 + 105^2 .

It is a de Polignac number, because none of the positive numbers 2^k-706581 is a prime.

It is a super-2 number, since 2×706581² = 998513419122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (706561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39246 + ... + 39263.

It is an arithmetic number, because the mean of its divisors is an integer number (170105).

2⁷⁰⁶⁵⁸¹ is an apocalyptic number.

It is an amenable number.

706581 is a deficient number, since it is larger than the sum of its proper divisors (314049).

706581 is a wasteful number, since it uses less digits than its factorization.

706581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78515 (or 78512 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 706581 is about 840.5837257525. The cubic root of 706581 is about 89.0677849126.

The spelling of 706581 in words is "seven hundred six thousand, five hundred eighty-one".