726666667 has 4 divisors (see below), whose sum is σ = 727880400. Its totient is φ = 725452936.

The previous prime is 726666641. The next prime is 726666701. The reversal of 726666667 is 766666627.

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 726666667 - 2¹⁹ = 726142379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726666617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 605968 + ... + 607165.

It is an arithmetic number, because the mean of its divisors is an integer number (181970100).

Almost surely, 2^726666667 is an apocalyptic number.

726666667 is a deficient number, since it is larger than the sum of its proper divisors (1213733).

726666667 is a wasteful number, since it uses less digits than its factorization.

726666667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213732.

The product of its digits is 4572288, while the sum is 52.

The square root of 726666667 is about 26956.7554983904. The cubic root of 726666667 is about 899.0387543649.

The spelling of 726666667 in words is "seven hundred twenty-six million, six hundred sixty-six thousand, six hundred sixty-seven".