667771 has 8 divisors (see below), whose sum is σ = 742784. Its totient is φ = 596160.

The previous prime is 667769. The next prime is 667781. The reversal of 667771 is 177766.

667771 = T₃₁₄ + T₃₁₅ + ... + T₃₂₆.

667771 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 a cyclic number.

It is not a de Polignac number, because 667771 - 2¹ = 667769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667741) 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, 426 + ... + 1231.

It is an arithmetic number, because the mean of its divisors is an integer number (92848).

2⁶⁶⁷⁷⁷¹ is an apocalyptic number.

667771 is a deficient number, since it is larger than the sum of its proper divisors (75013).

667771 is a wasteful number, since it uses less digits than its factorization.

667771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701.

The product of its digits is 12348, while the sum is 34.

The square root of 667771 is about 817.1725643951. The cubic root of 667771 is about 87.4062560650.

The spelling of 667771 in words is "six hundred sixty-seven thousand, seven hundred seventy-one".