6735721 has 4 divisors (see below), whose sum is σ = 6741072. Its totient is φ = 6730372.

The previous prime is 6735679. The next prime is 6735727. The reversal of 6735721 is 1275376.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6735721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6735727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366 + ... + 3688.

It is an arithmetic number, because the mean of its divisors is an integer number (1685268).

Almost surely, 2^6735721 is an apocalyptic number.

It is an amenable number.

6735721 is a deficient number, since it is larger than the sum of its proper divisors (5351).

6735721 is a wasteful number, since it uses less digits than its factorization.

6735721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5350.

The product of its digits is 8820, while the sum is 31.

The square root of 6735721 is about 2595.3267617007. The cubic root of 6735721 is about 188.8548010895.

The spelling of 6735721 in words is "six million, seven hundred thirty-five thousand, seven hundred twenty-one".