712666 has 4 divisors (see below), whose sum is σ = 1069002. Its totient is φ = 356332.

The previous prime is 712651. The next prime is 712669. The reversal of 712666 is 666217.

712666 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666217 = 29 ⋅22973.

It can be written as a sum of positive squares in only one way, i.e., 680625 + 32041 = 825^2 + 179^2 .

It is not an unprimeable number, because it can be changed into a prime (712669) by changing a digit.

712666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 178165 + ... + 178168.

2⁷¹²⁶⁶⁶ is an apocalyptic number.

712666 is a deficient number, since it is larger than the sum of its proper divisors (356336).

712666 is a wasteful number, since it uses less digits than its factorization.

712666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356335.

The product of its digits is 3024, while the sum is 28.

The square root of 712666 is about 844.1954749938. The cubic root of 712666 is about 89.3227351849.

It can be divided in two parts, 712 and 666, that added together give a triangular number (1378 = T₅₂).

The spelling of 712666 in words is "seven hundred twelve thousand, six hundred sixty-six".