6740729 has 4 divisors (see below), whose sum is σ = 6757620. Its totient is φ = 6723840.

The previous prime is 6740719. The next prime is 6740737. The reversal of 6740729 is 9270476.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4644025 + 2096704 = 2155^2 + 1448^2 .

It is a cyclic number.

It is not a de Polignac number, because 6740729 - 2⁸ = 6740473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6740719) 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, 7832 + ... + 8649.

It is an arithmetic number, because the mean of its divisors is an integer number (1689405).

Almost surely, 2^6740729 is an apocalyptic number.

It is an amenable number.

6740729 is a deficient number, since it is larger than the sum of its proper divisors (16891).

6740729 is a wasteful number, since it uses less digits than its factorization.

6740729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16890.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 6740729 is about 2596.2913935073. The cubic root of 6740729 is about 188.9015939295.

The spelling of 6740729 in words is "six million, seven hundred forty thousand, seven hundred twenty-nine".