6720605 has 8 divisors (see below), whose sum is σ = 8343000. Its totient is φ = 5190976.

The previous prime is 6720601. The next prime is 6720607. The reversal of 6720605 is 5060276.

It can be written as a sum of positive squares in 4 ways, for example, as 177241 + 6543364 = 421^2 + 2558^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6720605 - 2² = 6720601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23030 + ... + 23319.

It is an arithmetic number, because the mean of its divisors is an integer number (1042875).

Almost surely, 2^6720605 is an apocalyptic number.

It is an amenable number.

6720605 is a deficient number, since it is larger than the sum of its proper divisors (1622395).

6720605 is a wasteful number, since it uses less digits than its factorization.

6720605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46383.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 6720605 is about 2592.4129686452. The cubic root of 6720605 is about 188.7134221476.

The spelling of 6720605 in words is "six million, seven hundred twenty thousand, six hundred five".