667724347 has 4 divisors (see below), whose sum is σ = 681931296. Its totient is φ = 653517400.

The previous prime is 667724341. The next prime is 667724461. The reversal of 667724347 is 743427766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667724347 - 2⁷ = 667724219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667724297 and 667724306.

It is not an unprimeable number, because it can be changed into a prime (667724341) 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 3 ways as a sum of consecutive naturals, for example, 7103404 + ... + 7103497.

It is an arithmetic number, because the mean of its divisors is an integer number (170482824).

Almost surely, 2^667724347 is an apocalyptic number.

667724347 is a deficient number, since it is larger than the sum of its proper divisors (14206949).

667724347 is a wasteful number, since it uses less digits than its factorization.

667724347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14206948.

The product of its digits is 1185408, while the sum is 46.

The square root of 667724347 is about 25840.3627490018. The cubic root of 667724347 is about 874.0422050741.

The spelling of 667724347 in words is "six hundred sixty-seven million, seven hundred twenty-four thousand, three hundred forty-seven".