667726367 has 16 divisors (see below), whose sum is σ = 876307200. Its totient is φ = 492920640.

The previous prime is 667726337. The next prime is 667726399. The reversal of 667726367 is 763627766.

It is a cyclic number.

It is not a de Polignac number, because 667726367 - 2¹⁰ = 667725343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667726337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226742 + ... + 229667.

It is an arithmetic number, because the mean of its divisors is an integer number (54769200).

Almost surely, 2^667726367 is an apocalyptic number.

667726367 is a deficient number, since it is larger than the sum of its proper divisors (208580833).

667726367 is a wasteful number, since it uses less digits than its factorization.

667726367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456446.

The product of its digits is 2667168, while the sum is 50.

The square root of 667726367 is about 25840.4018351108. The cubic root of 667726367 is about 874.0430864575.

The spelling of 667726367 in words is "six hundred sixty-seven million, seven hundred twenty-six thousand, three hundred sixty-seven".