667867705 has 8 divisors (see below), whose sum is σ = 804882312. Its totient is φ = 532000128.

The previous prime is 667867703. The next prime is 667867741. The reversal of 667867705 is 507768766.

It can be written as a sum of positive squares in 4 ways, for example, as 133888041 + 533979664 = 11571^2 + 23108^2 .

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 667867705 - 2¹ = 667867703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667867703) 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, 285474 + ... + 287803.

It is an arithmetic number, because the mean of its divisors is an integer number (100610289).

Almost surely, 2^667867705 is an apocalyptic number.

It is an amenable number.

667867705 is a deficient number, since it is larger than the sum of its proper divisors (137014607).

667867705 is a wasteful number, since it uses less digits than its factorization.

667867705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573515.

The product of its (nonzero) digits is 2963520, while the sum is 52.

The square root of 667867705 is about 25843.1365162977. The cubic root of 667867705 is about 874.1047518305.

The spelling of 667867705 in words is "six hundred sixty-seven million, eight hundred sixty-seven thousand, seven hundred five".